Anonymous wrote:First step towards coming out as gay.
He may be genuinely bi but given the context it'd be incredibly rare and unlikely to be open about it at such an age and in such a volatile environment as middle school.
I'm in my late 20's and came out as bisexual when I was 13, but only to a few close friends. I remember being in middle school at a new school and noticing how many cute boys there were but also how many pretty girls there were - and I realized I noticed them in the same way. I definitely knew at that age that I liked both men and women, but I stayed fairly closeted until college and didn't even come out to my parents until I was 21 and it became important due to the fact I was actively looking to date women and I didn't want to shock my family. I know several other people, both men and women, that are around my age (mid-late 20's) who knew they were bi at that age - some as young as 9 or 10 - and came out pretty young as well. None of them ended up ever coming out as gay, although some definitely do have a preference for their own gender over others, which is a completely valid thing.
@ PP - Bisexual people are still bisexual no matter who they choose to date. You can be 95/5 or 50/50 or 30/70 in terms of gender preference and still be 100 percent bisexual. Not necessarily the first step towards coming out as gay.
As for your daughter, I think that she should treat her friend's identity as valid and be as supportive as she can. Middle school is an awful time, especially if you're queer, and if her friend felt safe enough to come out to her, then she should continue to be a supportive presence in his life no matter who he loves.