That's how it works in most abusive relationships. The perpetrator behaves terribly and then is forgiven. Like the tide coming in each time the abuse is worse, more damaging or in this case more demeaning, but the cost of exiting the relationship is too high because it means to become alone and people hate loneliness more than being shit upon so they complain and stay and hope that this time it will be better even though if they think about it they know it won't be.