Friend?

Tev

Okay so my bf and I got into a fight and my "friend" went up to him and told him not to go out with me and that I was shitty.. I found out she said that and I asked her.. She lied about and is avoiding me. I asked her about it and she completely turned it on me. Am I right for being pissed, did she do a shitty thing? Cause I thought she was a friend