Im in similar situation where court proceedings turned into horrendous personal attacks and lots of abusive behaviour which meant I insisted on contact via app and parallel parenting for my own mental health.
Now the settlement is done he’s being more reasonable. I suspected he decided to be adversarial for the proceedings and seemed to compartmentalise that but there’s no going back for me.
Also now facing request to use email again. I’m not going to. I get to choose my boundaries. I’m never going back to being the people pleaser which got me into this mess in the first place.
The hardest thing has been realising the person I used to think would always have the dc’s back can’t be trusted to put them first and in fact tried to throw them under a bus for a bigger £% he didn’t need.
Stick to the app. If you get an email reply via the app. If it’s not urgent don’t reply for a few days. I expect the novelty will wear off. After harassing me about extra contact (to help his case) ex has not asked to have dc for any holidays since the case ended. He has a partner so that’s also a useful distraction.
As the dc get older there are fewer and fewer events. So it will get easier. I am always civil at dc events but no longer friendly.
Hes already told everyone you were mad / bitter /money grabbing etc. it used to bother me as I got on well with his family / friends but now I only bother about what people I care about or whose judgment I value think. Keeping contact minimal works for me. Once someone has been abusive and manipulative they lose the right to give advice or dictate anything.
My dc are older. They love and see their dad but they also see him for the selfish person he is. They aren’t under any illusions about him. They understand why I don’t engage with him.