OP there's some good advice relating to your later posts.
I want to post because I'm in a similar-ish situation. I'm living abroad with my STBX and there's psychological abuse. It's not recognised as abuse in this country because he hasn't hit or raped me...
But the sheer isolation of everybody believing him is awful. My lawyer now seems to think he's a reasonable guy and I'm a bit emotional. I remind myself that I am a broken person and he's not and she doesn't understand it.
I spent years and years trying to understand why he behaved the way he does. Well, after I'd spent years trying to understand how I could improve myself to be "better" and meet his emotional needs better.
It may be helpful thinking of the abuse he's subjected you to as being brain washed. You've been brainwashed to put him above you - and you don't even know you're doing it because you're brainwashed! All your posts include him. I was exactly the same. I definitely have wobbly days.
Don't worry about forgiveness. He has no need for or right to your forgiveness. Forgiveness usually involves the other person too. Fuck him. Focus on yourself.
The unfairness of the whole situation literally hurts all over, from the inside out. That's because it's truly unfair. You can't change that but at least don't give him extra space in your head. I tried one day to catch myself and stop my thoughts every time he appeared in them. I was shocked by mid-morning. Not only has he stolen years from my life, he's still got control of me when I'm thinking about him.
Might also be worth noting that it's no surprise your ex chose a younger woman. 12 years younger is significant. He'll appear wealthier than her male peers, and he'll be able to pull the "I know more than you" trick, subtly or overtly, because he's older. In short, she'll most likely be very easy to manipulate. So he will definitely be abusing her. There's no doubt. But the way he's doing it will be different, because she'll be more pliable than a woman his own age. And she won't realise it's happening for quite awhile. It's very sad. Your ex hasn't suddenly developed empathy - as evidenced by him abusing your daughter (parental alienation is abuse).
I found The Covert Passive Aggressive Narcissist by Debbie Mizra quite enlightening. It's cliched to say an ex is a narcissist. Many are just arseholes, lazily labelled to allow the labeller to label themselves a victim. Some genuinely aren't wrongly labelled though. And some of us don't want to be victims, we'd give anything not to be. It's useful to remember it's not a diagnosis, but when I found a description of his behaviour it made me realise that really, I wasn't the only one and I also wasn't making it up. And that helped me start to stop thinking about him.
Btw I was abused for most of my childhood - psychological and physical. I've never abused anybody. Being abused may be a reason for bad behaviour, but it's not an excuse. It's in the abuser's interest though for you to find an excuse for him.