"I simply don't have the time, energy or want to guess what X is up to."
... then stop wasting that energy .... Those posts above have the same energy/obsession invested in them with respect to XW as posts written years ago. Maybe this has to do with the Adderall? I think maybe you are getting locked into some hyperfocused states on unhelpful topics (i.e. Deb). BTW, I couldn't use my Adderall because of breastfeeding, but I got an ADD coach for the first time who was really great.
Anyway, an R with XW seems like it would be as bad for you now as ever before. I see NOTHING in anything you describe to suggest that she is looking to reconcile OR that you are in a frame of mind in which you could respect her as an equal partner. Hate to say it, but pretty much same old, same old. BUT, on the bright side, it sounds like it is mostly confined to here and not bringing you down in your life.
Start looking at yourself, quit worrying about XW's actions.
Try a book by Anne Katherine on Boundaries -- short read, very good.
