Why does my friend tell her boyfriend I hate him when I don't? Now he hates me because she has told him I talk badly about him?

She tells him I don't like him/ talks shit about me to him. Now he starts arguments with me for no reason. And she stands there amused when we argue. Why?

Why does my friend tell her boyfriend I hate him when I don't? Now he hates me because she has told him I talk badly about him?
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