Most Helpful Guys
Not much can happen with him until he realizes it is over with with your friend. Once he sees she is no longer an option, then you can move in. As long as you or him don't get bad feelings about being "second best", then hopefully it works out and you have a wonderful relationship.
I may not be sure what he wants. I think he's just lonely at the moment and you fill the void for him mostly. He may like you a bit but will be hiding his feelings because he is not sure how you respond. Distance your self from him a bit for a week or two and monitor his reactions.