My question is mainly about if there's any hope I get together again with this man that I'm totally obsessed about.

Here's the story, I'm an 18 years old university student that had this major crush on that lecturer that was around 20 years older than myself, I started to try to talk to him and stuff and we got to know each other, superfacially of  course, I would catch him from time to time checking out my boobs or butt as I'm with him in his office. One day I got all courageous and I asked him out. He agreed to go out with me. Our first date went on well, I wasn't really sure if it was a date, I had my doubts that he might have went out with me as a friend. But then at the end of the date, he hugged me and kissed me on the cheek, he would message me and contact me more than once a day, and I would do the same thing, I was totally infatuated by him. Anyway, after about 3 weeks or so, he started taking things further, we made out, he would feel my butt as we make out, get his hands inside my top but not touch my boobs, it got really heavy.... but at the same time, everyone used to advise me to take things easy and slow because the chances are that he's just using me for sex.

That's completely right, this is a test to see whether he's just interested in having sex with you or if he's interested in both sex and you. 

It was so hard to do. One day, about a month after we first started dating, he tried to take things a bit further and because I was falling for him and everyone was being paranoid about it, I stopped him, I told him that I really want to do this with him but I'd rather wait to get to know each other more.

You worded it perfectly, if you worded it like that.   You were saying to him clearly you wanted to have sex but you wanted to wait to have sex.

We ended up, eventually (thats at the same day when I asked him to wait), that we will head to his place sometime during that week. But then he started to text me less but I thought it's not a big deal, he might be busy or something,

Not likely, he will be because he's now uncomfortable about what happened.  He will be embarrassed to a certain extent, but will also be debating whether he should continue with you.  Basically what has happened is both of you are not moving at the same pace as each other through the relationship.  When things get out of synch like this and one moves too fast for the other, things start to fall apart.

2 days after we agreed on going to his place, I was at his office when he broke up with me, He told me that people will start talking and the relationship isnt going anywhere, if it was then he would have taken the chances,

It's simply a case of he didn't see it going anywhere, so he risked having sex with you, he would have had sex with you for as long as he could and then wound things down when either you realised it was going nowhere or he felt so uncomfortable he couldn't continue. 

he also said that it's not because of the age difference. I wonder if that was true.

It's not true, age difference is unlikely to be a factor, most guys would love to marry a lady 20 years younger.  What caused this was he didn't see the relationship going anywhere, in other words, he wasn't that attracted to you to be able to say that things will last for a lifetime.  When guys get to his age they are wiser and know earlier whether a relationship is destined to last.  The problem in this case is he wanted to have the sexual fun before it came to an end.  He might have even thought you wanted some sexual experience of sexual fun.  And that is why he risked trying it on after a month and then when he knew sex was not going to be forthcoming that easily, he decided it's time to tell her things are not going to work out.

He said that he's a bit sorry he's doing that and that maybe something will happen between us later in the future.

So he wants to give you the option of running back to him, when you do this, he will know that you will off him sex on a plate, within days of getting back with him.  If you don't he will try his best to get it.

I believed him because I was in love. I got pissed at him and left while being really angry, I dont know if I over-reacted, what do you think?

I think you are bound to be angry in this situation.  He did something wrong, he tried to rush you into having sex before you were ready and you did the right thing and stopped him.  It doesn't really matter whether you over-reacted or not, this guy has no future with you, so there's no need to even consider the fact that you over-reacted, you were just expressing your feelings at the time.  

And from that day on, I was really mad at myself because I knew that if I had had sex with him, I would have kept him. He waited for a month, I read on one of your answers here that a month is a perfect timing.

Don't know which article you read, but I think I would have meant AT LEAST a month.  Ideally 3 months.  There's a process mentioned in my forum, which a relationship should go through before sex is considered, if that process is rushed then relationships don't work out.  The problem nowadays is that guys and indeed ladies have got used to having sex far too early on in a relationship.  This results in far too many relationship breakdowns.  These relationship breakdowns is because you have sex before you've got to know someone, you think you are in love with them because you've had sex, but really you don't know them and are unlikely to get to know them, because from the point in having sex, a couple can't stop thinking about sex enough to be able to think about getting to know each other.  The fact that he couldn't wait to have sex with you just demonstrates that he really wasn't that interested in you.

Any guy who would be that interested in you, would think, damn I've made a mistake, I feel uncomfortable but I want to make her comfortable about me again.  Not this guy, he didn't get his sex easily enough, so he feels as though it's time to move on.  For all he knows you might want him to wait a year to have sex.  But the truth is you didn't want to have sex then, you gave him a good test by doing that, he wasn't devoted enough to you, so it's time for you and him to move on.

I went up to him a week later to apologize for over reacting and to tell him that I'm cool about keeping things professional, but inside me I knew I wasn't, inside me I knew that I took this apology as an excuse to go up to him to see him. After that, we met on several occasions because we were doing this project. A very long time passed, like 3 months with no contact with him because of vacations and stuff, then we used to see each other, we would just wave at each other. One day, he was sitting with his fellow lecturers when he saw me passing by, he left them and followed me, he picked up his pace to reach me. He walked me to the building I was heading to, we chatted for 30 minutes when he mentioned a GF of his coming to the country soon in two weeks,

Was this an attempt to get you jealous, to hook back up with you and persuade you to have sex with him again straight away?  That's what I would question. 

I was devastated, I tried to hide it but I just stuttered and I decided I would change the subject, he asked me to go up to his office to talk some more, I did but this time he left the door wide open, I took it as a gesture but then I was so confused about why he left his friends to follow me, what do you think?

He wanted to make you feel safe and assured that he wasn't going to grab you in his office.  He wouldn't have wanted to risk that anyway because he would have wanted to see you outside of of work.  But it was a gesture to make you trust him.

then he showed me his GF picture just like that all of a sudden, we chatted for an hour, when I was walking out of the door to leave he was like "so how was your weekend?" I told him I went out on date, which was a lie, he looked speechless, he stopped smiling and there was no expression on his face and he kept asking me about who he is till I finally answered, then he said next time we talk I have to tell him all about it. To me, I thought he was jealous, that was so obvious to me, but it really confused me why he would get jealous while he has a girlfriend?

Because she was either fictional or he did have that girlfriend and wanted to use her to persuade you to have sex with him, then when she arrived he would have had two women on the go. 

Was it really jealousy? What does that mean? Why was he jealous at the first place?

Because it means you are less likley to have sex with him.  It also means he is less likely to have another relationship with you, if you have a boyfriend.  So, he will be jealous.  Whilst your relationship is finished, he will still hold on to the fact that something could happen, but the reality is, things didn't work out then, you are hardly likely to get together and have sex and things work out anytime in the future. 

After that, we would bump into each other by coincidence and we would talk for around an hour each time, we got along really great, we laughed, joked and communicated. Then there was his other time we met when he told me he went out with this OTHER STUDENT! I asked him about when was that, and he was like "a while back" I asked him was that why he broke up with me and he said "yes" I got upset of course, he said that we can talk about it the next day, he never contacted me the other day though, but we saw each other twice after that, he would stop to say hi and stuff. I felt like I was a naive girl after all.

He's playing games and trying to make you jealous, I wouldn't really believe what he is saying to be honest.

But still, I'd take him back if that's what he wants.

I wouldn't do that! 

I love everything about him. What do you think he wants from me?

Sex! 

Does he like me?

He likes your boobs and your butt and he wouldn't mind getting his hands on the rest of you.  Does he like you, well he probably likes you as a friend but really he just wants to have sex with you. 

Did he really like me?

I think he probably did at first, but when you get to his age, you know when things are going to work out long term and he didn't get that feeling.  As soon as he worked out things were not going to work out, he realised he could take the risk of having sex with you.  When that didn't happen, he knew it was time to finish because he wasn't going to get any sex too easily, and he saw nothing in the relationship to wait around for.

Do you think I can get him back?

Yes, if you offer him sex on a plate.  He's not going to have a long term relationship with you, he's just going to shag you for a while and then realise things were meant to work out between you. 

How can I do this?

My advice is to move on before you end up getting used for sex.  There's guys that want sex and a relationship and there's guys that just want the sex, you can choose which type of guy you want to go for.

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