Well guy, don't feel like the lone ranger. Alot of us LBS folks (if we're wise) can look back and admit where we screwed up on a regular basis. At the same time, we cannot continue to beat ourselves up. We can listen to their gripes, validate them, but after we've taken a good hard look at ourselves and seen what need to be changes, we should move forward in the present and future and do the best we can.
We can learn from the past, but unlike our MLC spouse we cannot live in it. Then we will get depressed and you know how hard it is to get day to day in that mess. We can't have 2 parents being that way.
Press on as best you can. Don't get your hopes up for a reconcilliation any time soon, if ever, and protect yourself emotionally and financially in the settlement. I'm in rnd 3 and it's much more civil, but I learned from rnd 2 that if you get too wrapped up in being fair (ie-giving away the farm-they'll take it!) and NO they don't see it as you being Mr. nice guy. You owe it to them for all the crap you've made them endure. That's how they think with the mlc fog in the brain. sorry. I wish you the very best of luck!