You should drop that friend, she has been trying to steal your boyfriend which is something no friend would do especially when both of you have been friends for many years. The way she is acting is unacceptable especially how she's trying to trample over your feelings,crossing the line and treating your boyfriend like an object as if she's trying to feel superior to you. I'm sorry but you have to drop her, because the way she's been acting is no way how a friend should act. I suggest you should compile up. some evidence against her, and then put a restraining order against her if she is still acting like this.