I'm fifteen, I really like this girl but she is bi and likes a girl as well, I don't know what to do or say. I'm not saying I Want to convince her to choose me, I just want help, helping her choose the right one, she is devastated that she can't choose between us, because she likes us both that much. I love her enough to say I would be fine with whatever she chose.

Then back off from your pursuits and let her make a choice without you influence.

I love her enough to say I would be fine with whatever she chose.

Then do that!

I have not attempted to influence her in any way, I posted this mainly because after a few weeks she can't decide, its having a bad effect on her...

I think she is having a problem rejecting your offer, so back off all the way. Maybe she just likes you as a friend? Obviously she doesn't want to make a choice, so don't make her. Drop it, don't ever mention it again.