good for you! i think you’re on the right track.
i hear the same thing from my guy friends about women they hookup with the first night. they’ll hookup for one night with them but they don’t want to have them as their girlfriends. booty call, maybe, but not a girlfriend.
i think you should ask the girl out that you like. my current boyfriend used to hangout with my friends too and he was nervous about asking me out too. finally he did and now we’ve been dating for a year.
you don’t ask, you don’t get… 😀