I refused to discuss D as long as my H was in a relationship with another person. I dont know that its possible in your sitch, but I honestly thought that he was reflecting his inability to make good decisions by seeing her (a married OW!), and this is a decision that requires clarity of thought, as it is life changing for all involved. Now hes the one who doesnt want to sign the papers.
One of the last times I saw H, hes in another state on a temporary duty assignment, he was sobbing, I just put my hand on his shoulder and told him that if he needs to talk, Ill listen. All I wanted was to hold him, but I think that I reacted appropriately, after a looong string of acting badly. If you back slide, you just start over. Its not that big of a deal, you will have other chances.
Im glad that you made sure to mention your dinner plans. It sounded like she noticed! Good job, dont let her ruin your great weekend!
I guess I gave the wrong finger to the wrong man...