Why does he beg to come back?

I’m trying to understand a mans thinking. He cheats over and over with the same girl. Our relationship is completely broken. We have gotten into screaming matches and physical fights because he begs for another chance and then does the same thing again. Why I forgive him I don't know. But the other girl does too. And she knew about me the whole time so she doesn’t fight about it at all. It’s clear to me he is happier there now. So why even bother pretending with me. Why not just let me be free?
Why does he beg to come back?
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