Fuck it. If you’re going to be in it for the long haul, this shit happens no matter how good the relationship is.
It’s not like you called her a cunt every day or physically abused her, right?
I bet there’s more to it. There always is. But calling someone a cunt isn’t the end of the world and there’s always going to be arguments where people say shit in the heat of the moment.
Good riddence if she can’t bounce back from an argument.