Why does my “friend” keep stirring the pot between me and her boyfriend?

I don’t like my “friends” boyfriend that much as a person, but I’m always polite to him to keep the peace. However, this “friend” keeps trying to stir the pot between me and him to make us HATE eachother. When I was out of the room I heard her saying to him “[my name] thinks you’re a pathetic little b****” to him. I have never said that, ever. That’s not even how I speak. And then he came at me and had an argument with me because he thought I said that. What is wrong with her? Why does she try to cause rifts and stir the pot?

it’s not just me she does this with, but it’s mainly me.
Why does my “friend” keep stirring the pot between me and her boyfriend?
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