Guys, Why would a guy talk about me in a bad way?

This guy I don’t even know said something rude about me to my ex while were dating. I don’t know if he thought I didn’t like him because I never really spoke to him because I’m shy. I’m not exactly sure. I do know when I first got with my ex he said I was pretty.

Guys, Why would a guy talk about me in a bad way?
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