Ex keeps on trying to communicate even though I made it clear that I don't want him to talk to me. Why?

He tries talking to me about small obvious things, keeps asking me questions and I don't respond by saying anything but just by actions. I never talk to him initially but he keeps on trying. It's annoying because he has hurt me and embarrassed me so why talk to me again and pretend like nothing happened?
Ex keeps on trying to communicate even though I made it clear that I don't want him to talk to me. Why?
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