Basically this is a yucky situation. The fact that your girlfriend is bisexual is irrelevant; if she were straight and were in love with your male best friend, you'd be in the same boat.
It sounds like you are not okay with the situation. Some relationships might be negotiated to allow this kind of situation, but you are obviously not open to this situation. You simply have to tell your girlfriend that you need more of a monogamous relationship. It's okay for you two to love each other but also decide not to stay together.
If your friend has expressed interest in your girlfriend back, then your friend has betrayed you. If she has not, or doesn't know, then there is no need to raise any of these issues with her. If she has, you should tell your friend that she has betrayed you (how and why), and that you are mad. Whether you two can reconcile depends on where you go from there and how you feel.
enjoy
well you can break up with the girl.. and go for the guy or.. if you love this girl than try to focus on the relationship you are in and not so much on the guy... but dont cheat on the girl.. she doesnt deserve that.
A cheating bi-sexual.
No he is not, he has a girlfriend i know because he is my idol and i love him so much!
Yes you should forgive her but because she may be bi, talk to her about it. If she thinks she wants to be with a girl more than a boy, it's time to break it off.
Try telling her a fantasy about her being with another girl and see the response. If she gets aroused or isn't against making the fantasy a reality then she may be a bisexual. Sexuality is a somewhat sensitive topic with some people, but you can try to ask her if she's bisexual. Also, note that a lot of guys assume that just because their girlfriend is bi that she will be willing to bring another girl into the physical relationship or that she'll let a guy watch her and another girl, which is often a wrong assumption.
welll im Bi so girlfriend but i do love sports but am kinda too lazy
The other girl would have to be Bi, Gay or Pan.
Well, one thing that works very well is pretending that you're gay. Girls love that. Then when she asks if you're gay, say no. Works every time.
She may be bi-curious
bi
yea im 11 and im bi i love girls i f*** my girlfriend all the time when were home alone from school :)
That's ok. Maybe Your Bi-sexual where you like both. what about a strap on?