It sounds like he is confused about what he wants. I think he probably likes you as a friend but is attracted to you physically. Or maybe he is just attracted to you. Or maybe he was just bored and made out with you because you were there. Or maybe there is someone else he is interested in. Or maybe he is an alien pretending to be a human and doesn't want to be discovered by the government.
You don't really know, and to be honest, you probably don't want to know. There isn't really a reason to know at this point. He said he wasn't interested in anything, so just accept that as the reality and move forward. Put him into the unavailable category and find other romantic interests.
Good luck.