I'm sorry...that sucks If you're getting attached to him, and he doesn't seem interested in more than just sex, I'd suggest ending things. Or at least starting to look elsewhere for someone to date. I was in a "relationship" like that at one point and kept trying to convince myself that I was fine with it as it was, but I ended up having true feelings for him and wanting more, which he wasn't willing to give. It eventually just sort of faded out, as I wanted more from him and he started avoiding/not returning my calls.

If you feel like a relationship is what you want, then try to find someone else who might want that, too. (I know, easier said than done...) Otherwise, you'll just end up getting hurt...