Why does my ex still want to talk to me after he's told me that I'm nobody for him and all this stupid stuff?

Today when he called me for the first time in since Tuesday, I told him that I can't talk to him anymore because he said I'm nobody for him and all this stupid stuff and then instead of admitting it he said that my dad was just telling me bad stuff about him. Why does he continue calling me after that fight and him saying that stuff?
Why does my ex still want to talk to me after he's told me that I'm nobody for him and all this stupid stuff?
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