The idea is not to argue. I would still mostly listen.

Just look at how I am agreeing with him. Then I state a truth.

Other good statements:

"I am sorry you feel that way."
"I can understand why you feel that way"
"It must be hard to feel that way"

"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