My ex is awful and impossible to coparent with. When we were together he was financially controlling / abusive, alcoholic, secretive, suspect he had emotional affairs, would coerce me into sex / sexual acts, would trigger my PTSD deliberately. I was very unwell when we split up (he ended things then said I'd been the one who had ended it). Since separating he completely refuses to co-parent with me. DCs are young (KS1), can't organise themselves. Equipment is not returned. Trophies / certificates from dancing etc. are hoarded by him and I never get to see them. He has secret girlfriends and doesn't tell me about them so I cannot explain to DC who they are. If I ask for a specific piece of clothing to be returned he ignores it. He emailed me to say that he doesn't check his email regularly (I am sure this is untrue! He used to be glued to his phone). But he has blocked my number so I can't send him sms messages. He refuses to tell me if he can take DC to their friends' birthday parties, so the other parents don't know numbers and DC get confused about whether they are going or not. I pass on messages from school about things but he doesn't. He talks badly about me to other parents at school. He has some relatives who are DC age who have quite severe emotional issues and they bully our DC; I have sent exH a long email outlining my concerns (younger DC was actually having nightmares about these relatives). I got no reply from ex about how he would be keeping DC safe (I am not blaming his young relatives it is not their fault, they had drug addict parents, foster care etc.). He refuses to extend even the most basic courtesy to me e.g. won't say hello at handovers or even speak to DC in front of me (which makes it weird for DC, and they already hate going to contact). Even at Christmas he just stood there glaring when I wished him merry Xmas.
He will only message me in order to scold me e.g. I DC wasn't wearing pants to weekend contact because he had had an accident when we were out and I'd only had spare shorts then I had forgotten he didn't have underwear on.
He has repeatedly called social services on me; i am not under any investigations but because of the animosity it is open to the early intervention team. They all just say my worries should be taken back to court and are looking to close the case. But i have no money left.
I am at my wit's end, I hate the idea of being in this limbo for the next 10 years or so. Please, any advice? He is just so horrible and nasty.