Tell her "There's really only two things to talk about: our marital relationship, and the END of our marital relationship. I'm not going to discuss the former so long as you've invited a 3rd person into our marriage (alt. version: "so long as you're having an affair"), and as for the second, that's really best handled by attorneys, I think." Then you add, without pausing, "Now if you'll excuse me, I'm going for a run," or "I'm going to go get a workout in," or "I have another appointment I need to get to," and you excuse yourself.
PDT is wise. Burn your statement into your brain. Visualize your actions before the encounter.
"What is best for my kids is best for me" Amor Fati Link to quotes: https://www.divorcebusting.com/forums/ubbthreads.php?ubb=showflat&Number=2879712
