From my experience, agreeing with my W's feelings was very productive. At first, I would think "but if I agree with her feelings, my butt is headed straight to divorce court". Wasn't necessarily true.
This is correct advice. Learn to agree with their feelings. Agree, be sincere, then shut up.
"You are right, we should divorce." "You are right, it probably won't work" "You are right, I did do those things and I was wrong and I don't blame you for wanting out."