What are you supposed to do when your ex is talking about you behind your back?

This guy I worked with at McDonald'sis 36 years old and was supposed to be my dad's friends but he went behindhis back and dated me. I wish I would of never dated him I didn't know better because I was young and naive. It is been a year now and he is deciding now to talk trash about my dad and I behind our backs.
What are you supposed to do when your ex is talking about you behind your back?
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