Do you know what, his narrative of 'you had a loving boyfriend and your ptsd led to you kicking him out etc.' means nothing. It's just his interpretation, it doesn't mean it's true.
He could genuinely have been the best boyfriend in the world with the greatest kids and if it wasn't working for you, for any reason at all, that was enough for you to end it.
In my opinion, your past had nothing to do with it. Him being disrespectful to you and not parenting his children properly had everything to do with it.
I wouldn't even respond to his mother, but if I did I'd just say something like nolongersurprised suggested in the last thread.
As for him, it really doesn't matter what he, his mum, his mates all think. You know the truth, you and your child are happier now and that's all that matters.