Why do I feel bad being mean to my cheating ex?

He cheated on me. Every time he has tried to approach me it has turned badly. I have to be mean to him so he stays away, but then i feel badly. I just want to protect myself, but I remember he is a person too. But, he didn’t care when he was cheating on me that it would hurt me.
Why do I feel bad being mean to my cheating ex?
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