I feel for your kids and you, bro. No human should be subject to this; all these bitter feelings reflect how unhappy they are with themselves narcissistic behavior 101. They will never assign blame to themselves. I’ve been through some of this.
Some of us here are suckers for punishment, too; we are attracted to stronger personalities, but it comes at a cost to family and friends. I was always the happy soul, the socialite, and we do what we must because tomorrow we need… help. An aggressive person and an unhappy soul who doesn’t like anyone or want to socialize who can they call if they get someone to assist them? It’s not because they want to; it’s because they fear the repercussions of what could happen if they on’t.
Another thing I discovered is the pettiness.
Another side note: it’s not a wasted 20 years. Besides the kids, there were some happy times, and during fights, focus on those happy moments and remind them of those times, because nobody remembers the good times; everyone just wants to remember the shitty times.