We can not know that and thus can not provide you with an answer.
Whether you are bisexual or gay hooking up with another person is no different than straight people doing the same thing and it is cheating.
Yes. Cheating is cheating.
I assume you're a guy, and that she is bisexual, or her friend is gay/bisexual. You're just being paranoid. Its okay. It really is. It happens to most people, men and women. You just need to relax. If you're treating your girlfriend right, she won't be cheating on you with anyone
If you have a girlfriend and a boyfriend, then you are cheating on both of them.
Depends if you are a boy or girl searching for a girlfriend.
maybe, maybe not.If he spends more time with the girl he is cheating on.
You can tell for sure that your girlfriend is cheating, by catching her on the act with her lover.
A cheating girlfriend is always hesitant. She might not be able to answer what you are asking.
he is totally cheating.
Yes. Unless your girlfriend is bisexual, and her best friend is bisexual or gay.
I don't dream about your girlfriend