It seems to me he might be using you. If he had any feelings for you he would call you for other things which do not include any type of sex. If you want to test him do this, next time he calls ask him to just watch movies with you instead of having sex. If he changes his mind about coming over then that's a clear sing his not into you. And if i guy who i was having sexual encounters with didn't kiss me it's because all he wants is sex from me. It shouldn't matter if you have braces or not a guy who cares for a woman would kiss her. Honey you should really move on you could do so much better with someone who loves you for you and not for the sex. Remember next time he calls don't have sex and see how he reacts.