Narcissistic ex blames me for moving on.

My ex is the most narcissistic person I’ve ever met . 6 years and 2 kids later I finally found the courage to leave (and stay gone). He, on the other hand can not accept the fact that I’m finally able to live without him and is constantly asking for another chance & promises he will change, don’t worry I don’t believe it, I’ve heard it for 6 years now and 483927294 chances and nothing ever seemed to change . Except now, he is contacting me asking if this is how I REALLY want our kids to grow up, without both parents, how could I want this, why won’t I take him back so they can have the family they ‘need’. Not understanding he put me through hell and back when I was trying to keep this family together, while he constantly put us last, but now that I know better and needed to be free of his bs, he truly honestly believes we are like this now because it’s what I want! I can’t erase him from our lives so how do I deal with this? I’m trying to be nice and keep things civil for our kids sake, but it’s getting to the point I just want to hate him and stop being so nice about everything.

Please, any opinions would be useful. Thank you ladies xx