Why did my ex text me “hey” after he told me he doesn’t need me in his life?

My ex cheated. I found out. A few days ago, i texted him some very mean stuff because i was so angry and upset. (Not an excuse. But, it’s what i did it). He replies back with “you are a toxic and hateful piece of garbage. I don’t need you in my life. Good riddance”. Then he blocked me. A few hours later he unblocked me. Then 3 days later he texted me “hello”. I didn’t reply until the next day at 11pm. I wrote “why are you messaging me?” He didn’t reply. What is wrong with him?
Why did my ex text me “hey” after he told me he doesn’t need me in his life?
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