Dave-- I don't know what to say when we get to those realizations...but you have always been much more clear-headed about reality than I was, anyway. I wish I hadn't gone as far down my path as I did; I'm not sure how co-parenting will ever work for me. Right now we are just parallel parenting--no verbal communication or contact at all (except attending my S's concert this week, and that was brief).
You are stronger than I. Keep focusing on those great kids, and yourself.