I'd be tempted to do a major 180 and just quit the M counseling. Tell her that if she's committed to being in a M where she remains loyal and faithful and committed for better or worse until death do you part, you're willing to do what you can to be a good partner. But if she's going to be perpetually critical and controlling by hanging D over your head, you won't accept that in your life. Then I'd tell her either she moves back into the same bedroom and promises never to use separation again, or I'd say the next time she brings it up I'd file for D and never look back.
Me:38 XW:38 T:11 years M:8 years Kids: S14, D11, D7 BD/Move out day: 6/17/14, D final Dec 15