Is this sweet guy using me for ?

Has he stopped sleeping around? From your original description it sounds like he really gets around; but if he's stopped that ever since meeting you then that means that he's ready for something more serious. I know you said you just got out of a relationship, but if this guy makes you happy why wouldn't you go for it? You don't have to think about the future, live in the moment like you said. Enjoy the time you spend with him and see where it goes from there. If he seems too shy to make a move, you can do it. Hold his hand or something. Let him know you are interested!