My H's brother is actually a psychiatrist. My BIL told my MIL NOT to talk badly to my H or his OW and certainly NOT to ever put them down. It only intesifies their underground attachment. Sounds crazy but it is crazy. He is a doctor and he is worried for his family too. My MIL is now suffering from depression.
I am in the same position as you because I think my H feels like he also rescued the OW.
Instead write your letter on my thread! It will purge your anger and resentment in public.
About resisting: Imagine telling the other OP your love history only to have them laugh. Imagine pouring out your heart only to have them look at you in apathy. Imagine how Britney Spears felt when Shar Jackson told her that she was pregnant with Kevin Federline's baby and that they already had a daughter together only to have Britney to say, "Me next!" The OP feel triumphant already. They are non issues. We must never be as low as them.