Just as he spent his time gaming and leaving everything to you, he is both refusing to take any responsibility for the end of the relationship or to step up and make this transition easier for his children.
This is EXACTLY who he is.
He has shown that to you.
He doesn't want a partner.
He was a skivvy aupair to do the donkey work of rearing his children.
He doesn't love you or his own children.
When you love your children you put their welfare first, their happiness and security is a priority.
He is not that man, never was, never will be.
He wants someone to make his life easier so he can game in peace.
Thats it.
Anything else is wishful thinking.
Let him rant, he will continue to try and put this all on you.
Anything, rather that step up and do the right decent thing.
You are so well rid of him.
The teenage years will be a chaotic hell with such out of control children.
You have no idea how difficult things can get with teenagers that are challenging and are dys-regulated and will not be reasoned with.
Not to mind mental health problems that can arise for such a chaotic childhood.
You are well out of it and will be so glad that your focus can be on looking after your own child alone. Believe me.