Why is he doing this?

I was with a guy for a few months we got into an argument (he started it) stuff was said and he broke up with me. This was a couple of weeks ago. Today he messaged me saying he hated that we hated each other and he wanted to make it right. I messaged saying I was hurt etc he messaged another nice one but then out of the blue he turned nasty and started name calling me and saying nasty stuff. Why? Did he just message to abuse me?
Why is he doing this?
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