This woman is nuts and her mother made her like that, it's awful parenting.
My dad had an affair, married and has been with the OW for over twenty years. He also had other affairs. I see him as weak, but I don't feel cross or angry about it all, I feel glad my mum found out and we all moved on, including her to someone much nicer.
I don't feel as scandalised by cheating men, in that I consider them unpleasant individuals, weak and a bit rubbish all round, and not suitable to have a relationship with, but I don't feel that level of aggression or revenge towards my dad, partly because my parents have been better apart and ultimately my mum has benefitted from his ridiculousness.
Revenge 12 years later is bizarre and speaks to extreme dysfunction.