@NeverDropYourMoonCup
To use blunt language - he is an abusive fucking loon and so are all of his family (who probably were quite pleased he'd found a victim to take him off their hands).
Of course you feel awful. Who wouldn't after being subjected to abuse for years?
However, in time, you will begin to feel better. Probably around the time that you realise it's fine to speak, look and think about somebody other than him. Want to make eye contact and smile at the bloke behind the counter at the Coop whilst saying thank you? Go ahead, it doesn't mean you're planning how to jump his bones by the baked goods aisle. Want to take your DC to the park and have them play with another child whilst you chat to their parent in the sunshine? You're good now. Want to twat about on the internet for an hour and not worry about having anything you type being inspected, analysed and used as evidence for further abuse? You can do that now.
For the first time in years, you're FREE. Your thoughts are your own, your body is your own, your time is your own. Free. You don't have to deal with that shit anymore. His emotions are not your responsibility. You owe him and his fucked up family absolutely NOTHING.
Being able to breathe fully after being trapped so badly is scary. It doesn't feel normal. But you can do it and, as you get to do it, it will feel so good.
OP, this is a good summary.
I left my emotionally, financially, verbally, sexually, etc, abusive ex after 30 years.
My god, I felt guilty initially, because I'd been conditioned to think of his needs and wants first, and me last.
And even though he had depression, quite badly, apparently
it still didn't give him a free pass to treat me badly. Same for you, his MH was not ever an excuse to treat you badly either.
Good for you on getting out of this, and now block him and his family. Whatever he says about you, people who know you, or who get to know you in RL will catch on sooner or later (sooner in the case of my ex, he did rather overegg how "bad" I was to him and they soon sussed him out).
More than 3 years on, I feel great, getting healthier, looking better and working my way through my bucket list and planning to start dating this year. (30 years is a long relationship, I needed to heal and work on myself first.)
So, no it's not you, you're not to blame for his behaviour. This is all in his control, and don't let him manipulate you with stated or implied threats of self harm. I doubt he'll do anything, except maybe a feeble attempt to reel you back in. (Been there, he was never going to hurt himself.)
Best of luck, and go forwards into that shiny future without his weight holding you back.