I cheated once with a guy an me an my boyfriend moved passed it?

Now everytime we fight he brings it up an starts no matter what we’re arguing about. He will always bring that up. He breaks up with me every day over everything even little things. He’s always accusing me. He’s always in my phone. He’s always talking everything I’m doing it’s just a lot I don’t know what to do anymore. I literally haven’t done anything, since that first time it’s been months I feel like I’m always just trying to make up for something. He’ll never forgive me for every time he’s upset he blames that situation. Should I just leave and walk away?
I cheated once with a guy an me an my boyfriend moved passed it?
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