Well, every situation is different. In my case, the OW sought out & stalked my ex. She cheated on her spouse & child. That does not make my ex without fault but OW's h told me she had been going after married men for years.
Maggot made no apology - she flaunted "her prize" she taunted & aggravated, tried to move in on my kids, my friends etc.
This is not someone I want to forgive. She is someone I'd rather forget.