Is he only in it for sex?

OMG, I went through this very same thing. And yes he is.

I mean there's a reason why he's keeping you around, yah but really if he's not taking you out or open about you with his friends, than he's just using you.

My best advice is to stop having sex with him and start hanging out with him. If suddenly he's busy all the time or can't get back to you, you know he's using you. And if he tries having sex with you, tell him no I just don't feel like it right now.

If you guys, do nothing in public or anything and all you guys do it go straight to the bedroom then he's sexually using and attracted to you. I know many guys like that, I had something like that before, and told him not to talk to me, because of the fact that he just wanted sex. If that's what your heart is telling you, does he talk to you? I don't know because you didn't exactly explain but if he barely even talks to you. Then it's not worth your time, when you could find someone, that likes you for you, spends time with you, cherishes the time he does spend with you but still have sex & not have sex as the main event in your relationship.

Does he talk to you? Does he hang with you in public? Then probably, it's just a new relationship. Usually in new relationships, that's all you do at first - have sex. Those are the good times. When you stop having sex, THAT'S when it can get boring.