My girlfriend hit me?

We're both 22 years old and dated for 4 years. A few days ago, I kissed another girl and regret it a lot. I then told my girlfriend about this. My girlfriend then slapped me after I told her. She started crying and yelled at me for being unfaithful. I kept apologizing to her.

After being dumped for a while, we agreed to stay together, but she thinks that it is ok to physically assault a person. She won't apologize to me for slapping me. I did cheat, but think she went overboard by hitting me.

What should I do?
I don't love the girl I kissed. My girlfriend is the world to me
Did I deserve to be slapped?

My girlfriend hit me?
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