Hey....totally understand.
Had this for years with my ex.
Firstly and honestly..find a counsellor to off load to and help re wire and calm your nervous system. It triggers so many sparks when someone you trusted and pr9bably made loads of sacrifices for😫..acts like the victim.
Yes..Kids may believe it at the time and yes it hurts. Its awful as it's untrue and awful because it's placing the children in emotional danger and the fact the paretns should both be trying to say and do what's right for their children(not using them as tools to hurt the other)
As they grow, they start t0 make own decisions.
If it helps at all, my ex told the kids id had affairs, that I'd refused to work, that I spent all the money, that I lied all the time/ wasn't truthful, that they'd have to wait until they were pld enough to see the REAL me and find out the truth etc etc.it was utterly bizarre.
I'm autistic and one the tisms I'm rather learning to love is that I am unable to lie. Literally can't. Of course everyone's truths and the way they see a situation is different, but over time I made sure I would listen (never angry) and then id say "im very sorry that daddy has the need to tell you these things that he must think are true" or " kids im sorry you had to hear all of this again".
I got it wrong of course i did (a lot) and had a few tears and when it first started ...he was dating and on swinging sites reallt quickly and taking kids to meet casual partners (yes,honestly) and also would tell the kids to lie etc..
Keep going and br consistent....It opens up a really positive communication beyween you snd the kdis. Itll take a while but youre mum and here for the ling haul. Try not to worry dayto day.
I now have almost all adult children and one has no contact, 2nd openly says his dad is a wally and not a proper dad and there third one really isn't that bothered either way. Its a shame as we are a small family as it is!!
The best bit is that I know my conscience is clear.
Keep being you. Please try not to let it under your skin. He is doing it to hurt you and the kids..especially as they grow older and have own kids, they wont put up with it. My oldest has children and that's the one who hardly speaks to him.
He remembers all of it xx