She is ruining our friendship

My friend always said we wouldnt let guys get between us, but now that she likes a girl she is letting her get beyween us. Should that be fair. I mean shouldnt it still be the same. She always said if we lost our friendship she wouldnt know what to do, but now I am the one thats hurt and scared and always wondering whats going to happen next. I mean we have been talking to each other without no problem then boom I get on yahoo last night and her girlfriend gets on there and starts calling me names and saying I was a liar. I never even said anything to her. I dont even have a clue what she was talking about. She was trash talking me and my family then she tried hooking up with me. And I am so not that way. I like guys all the way.

Well that's just not fair. The promise above usually means not to fight over a guy that you both fancy. But calling you names and talkin' rot about your family is just wrong. Especially seeing that you didn't even do anything in the first place. Try to talk to her alone without her girlfriend and see what's up.