I was going to say the exact same thing.
@LastOnePlease and @Zebracat have hit the nal on the head.
Your mantra when you feel like this is "He has done a number on me"
The number, comes across to me as a vibe that you are always thinking about how you didn't do something or could have done it better. You doubt yourself. He did that.
You mention the few times in 13 years that you objected to something, were told you were controling and had to put up with it anyway.
This man left you with FOUR children. FOUR! and because his outrage at you asking for CMS which you are entitled to, you are considering not asking for it because it would be hard to put up with his anger and he would tell everyone again you are controling.
I wonder in real life how people would respond to "My wife wants me to pay CMS for my 4 children... she's so controlling."
Remind yourself that he's getting cross about CMS, because its money that could go into his TWATOO TRIVIA fund and spend on himself.
You on the other hand want it to support your FOUR children. Every penny that he doesn't pay you is a penny that you will have to find elsewhere and will restrict what you can save for your children's future, if they want to go to uni, have unexpected medical expenses, need braces, school trips which they'd love to do but can't afford, your family holidays with them- all of that...
Whilst he dances off saying things like " Hey kids, sorry I didn't contribute to your housing, clothes, food, and expenses all year, its just that I didn't want to be controlled and the thought of doing that made me so angry, but hey why don't I take you to the zoo today as a treat.. I bet your Mum never does that!"
He has put you in the mindset that everything you do is wrong, whereas its only right that he behaves the way he does. In the future, he will either start learning from this and improve or diminish.
You kind of apologied to us for saying that you'd blurted out that you missed him. That's not something to be sorry for.
You shared an honest human feeling, based on the fact that he's your DC's father and the time you shared together, which you valued... and he hasn't got the compassion or character to regret the loss of those times as you do.
You are a better parent for having that empathy and compassion to value that family time. You are managing this situation so well and with your DC at the forefront of your mind, they are so lucky to have you. I hope you do get extra support, with time and therapy and your brilliant dad. it won't be forever. Step by step and also look forward to the time when you are not made to feel that everything is your fault.