Even if she did do something that would "make" him call her a bitch, he still shouldn't be calling his girlfriend a bitch and stay with her. If someone feels the need to call their significant other bad names, they shouldn't be together, imo. But, I saw that the OP commented on this herself, and turns out, it was nothing negative -- he meant it as she's "his bitch," playfully, but now that he's realized it upset her, he stopped. Yay, happy ending. :)

I agree completely. If your partner does something you can't forgive, you should leave them, not hold it over their head forever to get some sort of superior leverage in the relationship. In that case, you're no better than the one who wronged you.

No, I understand, and I'm glad that there was a happy ending for OP. I don't mean to make any assumption about her. I just meant that as a generalization, if one is being called a bitch, there might be a reason behind it. I've known girls who can talk until they're blue in the face about how they're mistreated, while in reality, they don't treat others well.