One day at a time, one minute at a time if needed one second at a time if needed.
Are you meeting him today???
You need to ACT AS IF you are starting a new relationship. Listen more than you talk. (remember his words so you can make your changes) Validate his feelings IE "I understand you feel that way", "I can see why you feel that way"
Do not argue, just listen to his POV. You do not have to agree with it, just understand it and show EMPATHY and COMPASSION.
Avoid Relationship talk like the plague, If he initiates just listen, "I need time to process that" is a good phrase to state if he asks your POV.
Be upbeat, happy, confident, looking acting, smelling good.
"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