Wow, that sounds really hard.

Here's a virtual hug.
You are not the horrible things he's told you that you are.
I have recently been in exactly your situation, where my kid's dad said some of the most horrific things to me. It can be incredibly damaging.
EMDR is super helpful for me. I think that's a great way to take care of yourself at this time.
It can help you be less reactive and more centered so that you can process out your feelings better.
It doesn't take away the injury. There will still be emotional effects. You're not a robot.
Do you place expectations on yourself to basically gloss over his behavior and live a productive life in the midst of verbal abuse? Man, I do, sometimes, and he plays on that to blame me and get me to thinking I should be doing something that is actually extremely challenging: not be affected by his behavior so he can downplay it and not have to feel shame about it.
What makes you feel that "being nicer" means "taking what he gives".
It's possible to set boundaries without being mean and rude.
It's hard to get to a place where your triggers don't elicit a reaction. Even with EMDR, some things still trigger me, I just don't have as intense a reaction. It is possible to become less reactive and more mindful. It's challenging to do that in the middle of an environment that is currently traumatic, though.
It sounds like you're feeling really hurt and vulnerable and you can't share with him how his behavior has affected you.
You can share with us.
How are you feeling today?