Why does my ex bad mouth me for?

My ex boyfriend, that I dumped 2 months ago because he kept cheating on me, he would try to control me, he would bad mouth me to his social circle even to my sister, while we together than he would lie to me, I found out his on sex offenders list due to its up on google. He asked my female friend to stay back home, not go over to my ex’s house with her partner than he asked her why am I controlling her & her partner for? She said to my ex that I’m not controlling them. His the one going around trying befriend my friends than he bad mouths me, I’m just ignoring him.
Why does my ex bad mouth me for?
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