I'm pretty sure I'm ready to give up. I surrendered last night. At this point, it's all about D, and I won't be able to co-parent with W if things get worse than they are. So I surrender.
I sent a message to OM2. You win. Treat her well.
Got back some "truly sorry, never intended to become a problem between you two, but life isn't a game and things out of your control happen sometimes. Don't be mad at W." Not exactly an admission but close enough.
Probably will still journal here and write emails to W I won't send. I think it's helping me get through this.
Thanks to everyone who tried to help, who gave me advice that I didn't follow. best of luck to all of you. None of us deserve to be here, but here we are.