[superheel]

Well yes, for me, that kind of situation really proves how much you love the girl. You hanging out for a moment is a good thing, you should ask her number and make her think that your intention is only to be friends with her. Or maybe make her boyfriend notice you, so he'll confront you and maybe punch you, if he punch you don't punch back. Just do the "We're just friends" thing. the girl will feel bad and talk to you more. You know what I mean? Don't be afraid that people will notice you, just make a move and steal her from that guy.