What the hell is wrong with me?? OR is it him?

Don't worry at all. Personally, I think you need to find other things to focus on. In this story you come across as clingy and desperate to me. Yea, sex may not be the main focus for him and maybe he really does like you, but there are times when people would rather date and see how things go. (Which is a reflection of when he told you he didn't want a relationship) Its only been a few months you say, and maybe he want to get to know you for a little better before making that commitment to you. Crying over him and being jealous is excessive and you aren't even together. If its a relationship you are looking for, move on, because that is something that he obviously doesn't want!