yeah uuh, honestly i would leave it alone. theres a million girls around and im sure you can find another one that you like. friendships arent worth ruining over something like that
Leave it alone. She doesn't sound like the world's greatest person if she'd ask that sort of thing while she is involved with someone else. Especially being aware that her boyfriend is your friend. She sounds like trouble to me. And maybe like she is trying to find out if you like her before she decides to break up with someone else. Covering her bets, I suppose.
Let her be with her boyfriend and don't make a move unless she's broken up with him. And if he's a really good friend, then make sure he's ok with it before you get with her.