Why does he not want to break up?

I’ve been with this guy since the beginning of this year. Everything in this relationship is odd. We weren’t getting along in the start of the relationship and the arguing would make him uncomfortable constantly threaten to break up with me. It then escalated to him joking about breaking up with me and him randomly sending me break up paragraphs to him actually breaking up with me.

We stayed broken up for a couple of weeks until he returned. Nothing has gotten better, in fact worse. I’ve been wanting to break up with him and he gets so upset about it that he says abusive stuff like no one would want me and if they did it was only sex. He’s broken up with me before so I don’t see how this will hurt him now.

Why does he not want to break up?
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