Boyfriend called me a whore. What do I do now?

He Called me a whore cause he is still upset that I was sexting a friends with benefits a week before us and kept in contact after saying I don’t deal with him.
It’s been 6 months and he bought it up again and called me a whore. He apologized but I don’t believe it. He’s called me mean names in a fight before. I left him and slept with this co worker of mine. I think I really like him.
What should I do?
Updates:
6 mo
A lot of people are misunderstanding what happened.
We were in the talking phase when I kept in contact with the friends with benefits. When my boyfriend (who wasn’t my boyfriend the) was was upset I blocked the friends with benefits.

I am not with my boyfriend anymore. And slept with my co worker AFTER the breakup. Only rubbed it in my bf’s face cause he kept begging me back.
I have no idea what I did wrong here. What’s the deal?
Boyfriend called me a whore. What do I do now?
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