Suppose I got thrown in jail for punching a dude for flirting with my girlfriend. What happens now?

Let's say a guy was repeatedly flirting with my girlfriend, after she and I told her to leave her alone. He says he wants to steal my girlfriend away from me. And I punch the dude in his face, thus hurting real bad. He filed police charges against me, and I go to jail for assault, despite the lawyer's attempt or my girlfriend's attempt to help me. Now that I'm locked up, I won't be able to see my girlfriend, which really sucks. Plus, this dude went right back to flirting with her. What happens?

If you were the girlfriend, how you feel about all of this? What would happen if the flirting dude wins you over me?
Suppose I got thrown in jail for punching a dude for flirting with my girlfriend. What happens now?
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