Obviously not compatible values of what each wants out of a relationship.
He wants someone who will satisfy his sexual needs & you want a REAL relationship. It's NOT abour time, it's not about him being busy. That is his way of telling you that you are incompatible to to meet each others needs without openly coming out & telling you what he really feels & wants. Some guys are afraid if they say what they think it will end up in an ugly argment instead of the girl just saying ok & going on with their life.
Go on with your life. He has told you what he wants & you know what your real values are......that equals incompatible. Go find someone who can give you a real meaningful relationship. Kisses mean nothing to many people other than "the thing to do at the time" (when they can't get what they really want)