Friends who try to sabotage you?

Anonymous
One of my best friend keeps telling me that any guy who flirts with me or asks me out, just wants to sleep with me. Meanwhile, any guy that talks to her is "serious" according to her. She's already in a relationship, yet when one of our mutual friends slid into my dms and was obviously flirting with me, she told me he "was just being friendly" and she ended up telling him some vicious rumours about me to put him off me. And he suddenly stopped talking to me. Why does she keep sabotaging everything?
Friends who try to sabotage you?
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