Jed Clampett wrote:
Forgive him.
You do not say whether he has continued that affair. Perhaps he regrets it and needs to feel forgiven. We all make mistakes. It does not have to finish our lives.
I think you can still admire him for his good qualities. That's what we have to do anyway!
What is there to forgive? He didn't end his cheating partner's marriage by himself.
Let's pretend we can act like adults as adults around our adult parents. I'd let this one go because it amounts to poor boundaries.