I have been seeing a guy for the past 2 months.  He says he loves me but I'm not sure whether I believe him or not. 

After a few months it's possible, it's better than him saying it after just a few weeks.

 
I'll tell you what happened.  Our relationship started with a one-night stand.  Afterwards he took my number and then he pursued me, calling me and texting me everyday until I saw him again about a week later, at his place. 

So only you saw it as a one night stand then!  He obviously didn't see it as just a one night stand, because you don't call and text a woman everyday after a one night stand.  If he religiously goes out of his way to contact you everyday, I think that's a sign of a guy that really likes you.  That is NOT to say that if a guy doesn't go to this length to contact a woman everyday he is not really interested.

Again we had sex and I agreed to come back the next day.  Since then we regularly meet at his place (about 4 times a week) and it always ends (or begins) with sex. 

The fact is guys like sex, whether he is using you for sex or whether he likes you a lot, he will want sex.  What is important to you, is that you are enjoying the relationship and getting just as much out of it as him.  He gets his sex but are you getting something good from the relationship too and do you enjoy the sex.

He calls or texts me everyday and always says romantic things to me. 

The fact that he does this, shows he is keen to hold onto you and is keen to impress you.

But he never takes me out or introduces me to his friends. 

The fact that he doesn't take you out, is something he needs to be pushed about, you need to tell him straight you want to go out somewhere.  The fact that he hasn't introduced you to his friends means nothing.  Friends provide competition, one of his friends might tap you up, his friends might be embarrassing and he wants you to get to know him more before introducing you to anyone embarrassing.

Although I fell for him early on I was convinced he just wants me for sex and so I kept things light-hearted and did not reveal my feelings for him or demand anything from him. 

It's best to have that comfort zone if you need it and in case you might become disappointed.

A few weeks into the 'relationship' he said out of the blue one night 'I love you.'

Oh, I thought you meant after 2 months, a few weeks is far too soon.  You can't fall in love with someone after just a few weeks.  He either doesn't know the proper meaning of love or he is doing this to try and make sure he holds onto you and to prove that he really does like you.

I didn't say anything as I wasn't sure whether to believe him and I didn't want him to have the upper hand by knowing my true feelings.  A few weeks later we were cuddling after sex and he said sadly 'You don't love me.' 

This is not the sort of thing that a guy will usually push, saying "I love you" is often uncomfortable to a guy, particularly if he doesn't mean it, therefore most guys will avoid the subject.  Your guy seems to be pushing it, so he must have some belief there, that he can bring up the subject and say those words with some belief.

I reacted by laughing it off and saying 'But you don't love me.'  Then he said 'Of course I love you.'  He talks about buying a car so that we can go away together in the future, but I'm not sure why he doesn't want to do things with me now. 

He sounds to me like an amateur with women, like he doesn't have the experience of knowing what to do with women.  For that reason he doesn't know that you want him to take you out places now, he thinks that can be done in the future.  It is good that he is thinking ahead and believing your relationship will last.

Do you think he is using me for sex and just saying these things because he thinks its what I want to hear? 

It sounds to me like he is trying to impress you and trying to stay in contact with you as much as possible.  It's not the sort of thing a guy does that is just using you for sex.  A guy that is just using you for sex will make as little effort as possible in between sex sessions and avoid getting himself into tricky situations, like proclaiming that he loves you.  He is having sex with you regularly, a guy that just wants to use you for sex will want to see you when he feels the need to have sex and usually that will be no more than a few sex sessions a week.  This guy you talk about sounds as though his hormones are running wild, like a teenager and that is a sign of a guy who finds you highly attractive.

Or does he love me? 

It sounds to me, like he thinks he loves you, but I'm not sure whether that's a delusion in his mind, because he is a little inexperienced with women and love.  I'm not saying it's impossible to fall in love with someone after two weeks, I just think it's a bit too soon to get that idea.  Love is so much more than that and you need to be definite in your opinion before making those comments, can you really decide that after two weeks?  To me 2 months is probably an acceptable time to think about making the proclaimation that you love someone, not 2 weeks.

I don't want to nag him or chase him away, what do you think I should do to get the truth out of him?

I don't think you can get the truth out of him yet, I'm not sure his mind is deluding him at the moment.  You need to see how the relationship progresses to find out the real truth.  In my opinion, he sounds like a guy who is trying his best to impress you, but a guy who is inexperienced with women and a bit too impulsive and experimental with his actions (like he is testing out different things on you to see how you react). 

He certainly needs to know that you want to go places with him now.  He's not a mind reader and you need to directly tell him these sorts of things. With him being keen to impress you, you shouldn't have any problems with that. 

The only way I can see him potentially using you, is if he is using you to build up his experience with women.  He is experimenting with you, to see what a woman does and doesn't like and trying to commit all his mistakes with you, before trying his luck with other women.  But I can't really say decisively whether he is doing this, but from what you have said it's more likely than the option of him just using you for sex. 

 
Until you have proof otherwise I think you can just believe that he really does like you and see how things progress in the next few months.  If he is using you for sex or using you to gain experience then eventually your relationship will become strained over the next few months, you might not realise why but one of those reasons will probably be the reason.  If your relationship continues to progress over the next few months, then I think you can presume you have captured yourself a man that thinks a lot of you.

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