It is a lot. While you may not be able to control some things, this is one thing that only you can control. If he is making you suffer, break free.
I am sorry you saw that post, and I pray that poster does not see that as our way here. It was not in the spirit of what we do here at SR, which is to support and encourage. We believe in you that you can make these changes in your life, now you have to move forward and believe in yourself.
I am a single mom. I get how hard it is. However, I analyze the other things in my life and try to minimize anything I can to bring myself more peace. That includes keeping toxic people out of my life.
I am legally bound to my XAH b/c we share a minor child. Even then, I speak to him as little as possible, and do everything in my power to have less stress in your life. You need a plan of action, and to follow it!
Sending you a hug.