I am 19 years old and at college. About 8 months ago, I met a guy in a club through a mutual friend. We kissed at the club numerous times, and he came home with me and my friend back to our house. He asked me to sleep with him, however I said no, saying 'I wasn't that easy'.

Good for you, just be straight to the point with him. 

We were both drunk, and then he said 'Well we can just literally sleep together than that's nice also'. I didn't mind all that much, so I said that was fine. We kissed in bed, however I stopped it there and true to his word, we just fell asleep.

Despite that, I don't really recommend women do that, especially if the guy is drunk.  Because even if he is normally trustworthy, sometimes it can just become too tempting.  You don't want to put yourself in that risky position.

I didn't see him again ( or really expect to ) until about 5 months later, where after his housewarming, and a group of us ending up staying the night, I stayed in his room and we once again were making out most of the night. He once again asked me to have sex with him, but I denied, stating the same reason as before. During the night before this, we hadn't been alone together or had an actual conversation. Then about 3 weeks later, I picked him and two mutual friends up from a dinner and brought them home back to his house. He was drunk, and I was sober, and he asked me if I wanted to come in and watch a movie, which I did, and we once again made out a lot, and played around with each other, however I said I was still not going to have sex with him, basically because he was drunk, I was sober and it was 4am in the morning, plus we weren't together or going to be together.  Afterwards I asked him not to spread it around his friends ( i am at college with all of them) as I didn't want to be a topic of conversation as I have heard other girls be. True to his word, he told all his friend (mutual) that we just watched a movie together.

One day at college, we ran into each other purely by chance in the library on a sunday afternoon. We ended up having coffee study breaks a couple of times during the day, and had good conversation, and when he mentioned something about a past girlfriend, and i enquired further (she was also a slight mutual friend) he told me the story in great detail. I paid for some of the coffee as he had forgotton his wallet..and the next day at uni he sent me a text message asking if a coffee break at 1 sounded good.. I said yes, and we had coffee again.

After this he started sending me text messages when he was out at clubs with his friends (usually drunken to which I didn't respond most of the time).

Drunk gives him the bravery to do things, he wouldn't normally do.  But it's positive that he's met up with you for coffee a few times when he wasn't drunk, well unless he'd had plenty the night before. 

I didn't take these as a sign he liked me, more that he wanted a booty call.

Yes, he was drunk and wasn't in control of his brain, so his brain was telling him he needed sex and just go for it and text all the women in your contacts.

Anyway he then messaged me a few times during the day, on one weekend. That monday night on the holidays, I went over to watch movies with him, and though we were planing on drinking, we didn't as by the time I got here it was 11pm, and then I had sex with him. However, I more initiated it it seemed then he did. We had slight technical difficulty, but nothing major at all. When I left the next morning, I asked if he could once again not spread it round his friends for the same reasons and he said 'sure'. The drunken text messages/text messages in general have stopped and he doesn't seem to show much interest if at all if we ever run into one another.

I know he doesn't like me that much, if at all, but I was wondering if you could tell me anything I did wrong? I thought perhaps that he took me saying not to tell anyone as a personal insult..

I would have taken that to mean, don't tell anyone that we had sex and I don't really want to go out with you, so don't tell anyone that we are seeing each other.  So, yes the first time I would have thought you were just being cautious saying that, but the second time you said it, I would have read it as "I've had sex with you but don't tell anyone because I regret it now".  Like you are not a good catch, so I'm embarrassed that I've had sex with you, so please don't tell anyone because you'll spoil my reputation.  And he won't want to tell anyone, because he won't want you telling anyone, well he was crap in bed anyway, we had technical difficulties.

Add to that the technical difficulties.  Believe me, no technical difficulties are minor to a bloke, if there was any hint that he had the technical difficulties, he will feel humiliated about it and feel as though you might tell other people.  He will also feel as though you might not want to do it with him again, if there was technical difficulties and so he will want to avoid the circumstance again.

or  when the whole thing was all about the chase.. and when I finally let up, it was over. I appreciate any advice you give me!

I don't think it's about the chase thing.  I think he's probably decided that after the technical difficulties, the way you don't want to tell anyone else and the fact that things have not gone particularly smoothly, he's probably thinking well, it's probably not meant to be.  I will just add it to my experiences and try not to make the same mistakes with her or anyone else again.  I think that's the most likely scenario.  You don't say how long it is since you had this sex session.  If it's a long time, as in months, then I would say he would have been back for more sex, knowing that he could get it.  The thrill of the chase doesn't really work for men, it's more a woman thing.  If a bloke manages to get a woman into bed and the sex goes well, he'll try and keep on plugging her for more sex sessions if he doesn't fancy her.  There's no element of chasing you, getting what he wants and then giving in, he would be back for more, after all he's worked his arse off to get that far with you.