Is this common or am. I extremely blessed to see her get a taste of her own medicine?

My ex husband cheated on me after 5 yrs of marriage He has been married to her and after 5 yrs of marriage he is doing the same to her. But he's better now becuz he's not actually sleeping with his mistress. She told him to get a divorce first. This is what he told me I still think even if your not committing adultery your leaving for another person thats cheating too. I know so many people that never see their enemies get what they deserve or do they Is this rare? Im not happy either one of them is going through problems but I am happy she will no longer be in my daughters life. And yes it is nice to know she finally understands how cruel it was when she was chasing my husband and destroying my life.