He likes me, he likes me not. what do you think?

This is really tough but I'd say that he does sort of like you but he knows he shouldn't because he has a girlfriend. So I think he's afraid that you two will end up in something more than a friendship and he'll like you a lot more than he should. I think he thinks you are so different from his other "girl friends." In this way I think if you express to him that you don't want to ruin his relationship then he might feel better. I think he's so scared of cheating on his girlfriend with you that he doesn't want to risk it.