The guy I'm seeing is very affectionate when we get intimate but when we're not having sex he never kisses me hello or goodbye or just to do so? Why do you think he does this?
It sounds like he's not that into you. If he really did have feelings for you, he would kiss you all the time. Not to be rude or out there. But if he only kisses you during sex then it just sounds like he's just trying to get laid.