There are a million ways to say this: Set him free. Do not try to control him.
Change the dynamics.
This is the mindset. You do not have to say these words: W:"H, This is no longer working for me. I do not want to be married to someone who is acting single. Do you want to keep the house, or should I start looking for a place?"
"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