Why do guys talk shit and bash woman that they were once involved with after a sour ending?

The guy in this context specifically fucked up & played the woman & he went back to his ex girlfriend & now he bashes her & avoids her & blocked her number, etc.

The woman who got played wishes him nothing but the best and wants him to be happy.
Why do guys talk shit and bash woman that they were once involved with after a sour ending?
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