I'll try to summarise briefly. Separated nearly 3 years, not yet divorced (he's dragging that out as long as he can). I ended things due to catching him out doing nasty things online.
However, despite starting out very sorry, remorseful blah blah, as time has passed he has rewritten the narrative. I 'gave up on him' when he was going through a hard time (his father died 4 years ago, he cut his mother out of his life entirely before that). He was being bullied in work. So I should have stayed and gone to counselling to work it out.
I get fairly frequent emails and whatsapps calling me selfish, cowardly, a bad parent, pathetic and so on. We share children so I can't cut him off completely. I have tried so hard to ignore the abuse and focus on the kids. I don't bite when he baits me, but it's really getting me down. I have asked him several times to stop, and he hasn't.
I think this is now harassment, and I'm at the stage of reporting it to the police.