well, she's not bi as far as I know but it doesn't matter to me for a few reasons.
1. I'm already with a wonderful girl, and I would NEVER cheat on her
2. she (my lesbian friend) has a girlfriend and they seem to be in a deep relationship (her girlfriend looks a lot like one of my ex girlfriends, ick)
and 3. she's too yung, she's only 17 right now (she'll be 18 in a few months)