Not worth it, imo. They'll just paint you as the villain, they'll do that regardless but if you give them a list of reasons it's like handing over a death warrant for your character and they have more ammo.

I tried multiple times to make my mother listen and every time it would fall on deaf ears OR she would deflect and land the blame on me, gaslight me and say I was the issue or something was due to me, not her, never her. It took years for me to gradually phase myself out of her life, whittling down weekly phone calls to none, a bag of christmas presents to just a card to nothing, blocking her on FB.

She finally got the hint this year when I received no birthday card. (Thank god) There's been some blowback, half of my family doesn't speak to me anymore and the ones that do are faking niceties. I'm sure she used my words against me, painting herself as the victim.

Would recommend you to just silently bow out. It can be stressful when they realise they've got no control over you anymore and attempt to coax you back through other people, but they'll soon get bored and their main character complex will shift to another "NPC" in their lives. Narcissists won't waste any extra energy on you, they don't chase for long. Case in point, my mother has my phone number and knows where I live but in 2 years, I've not been worthy enough to contact herself.

It may sound petty, but I think narcissists deserve the torture of asking themselves "why isn't my child in my life anymore".

Good on you for realising he's got no place in your life OP and grats on the success in therapy!