I don't see that analyzing him can help. It is too bad you did not take the relationship as casually as he did, did not read the "signs". I have a guy friend who seems a bit similar to yours and that's just how he likes his life; to each his own? My friend though would marry each woman right away and then get divorced (he doesn't date now, like your guy, and jokes that next time he'll just give the woman a house instead of marrying her (what ultimately happened with his two ex-wives)).

I'm sorry you have this guy to "get over" (or make friends with; my guy works well as a friend because he use to work with my husband so is "our" friend and there's never been anything sexual about it but he and I are the same age and have a bit more in common interest-wise than he and my husband) but I'd give him up; if he has a pattern of behavior and likes it for himself, I don't see why he sh/would change it for you?