Search Results: called the wrong name

So this girl had a huge crush on my boyfriend a couple years ago. They were a thing for like a day. She has had lots of bf’s and always talks to him about them. She hates me. First time he told her about me she called me an ugly ogre. A friend of his asked my friends if they knew about his two gf’s and said her name. I asked my boyfriend about this and he denied it. I believe him, but I just don’t like him being friends with her. I’ve tried getting to know her, but she’s always really rude to me asking him later “what why the heck did she try talking to me?” I asked him to cut her off and he’s doing that but is like rlly sad about losing a friend. Was I wrong to be worried? Am I wrong to cut off his friend because she threatens me?