I forgot your bit about "if you end the A, I'm here and willing to work with you......." script. Can you please help out here as my mind blanked out?
"However, if you will end your affair -- and I mean absolutely no-contact, you send a letter and agree to be fully transparent with me -- and come back and work on the marriage with me for some set period of time, unencumbered by a third party. Let's say 6 months, or a year" ... (and don't make this any LESS than six months) . . . "and then it doesn't work out, for either one of us? Then I think I could not only still be your friend if we divorced, but probably pretty good friends going forward, as at least I'll know we tried."
That's off the top of my head, Wonka. And I just added the part about N/C and transparency, because now that I think about it, I think you have to let the wayward spouse know what you would expect.