We are very close to each other and every time we see each other we have sex but we do other things of course! I met his family 1 month ago.
But... For example, we haven't see each other in 10 days, we talk everyday and he is just saying "that he miss having sex with me" or "that he can't wait to have sex with me" but he never say he wants to see me or talk with me. Is a bad sign?
Is it a bad sign? I'd think so. Try avoiding sex for a while and see how he reacts. If he reacts in a negative, aggressive way, I think you know the answer. If he seems indifferent, seems like maybe he wasn't just after sex. From what you've said though, seems like he's just after sex. I miss being with my girlfriend just for her company, not for sex.