I'd gather ALL her stuff (notice ALL in caps) from the MB and box it up and put it by the front door. Tell her that you agree with her and she should move in with OM, but not gradually. Immediately. What's the point of keeping her around and you both being miserable. Your kids already know. Why not just rip the band aid off instead of prolonging a $hitty situation? She can't even find the time to feed her own children. She's banging another dude. She doesn't care about you or your feelings. Tell her to beat it, and the kids will live with you. Talk to a lawyer. See what the laws are in your state about moving kids out of the marital home and in with an adulterous stranger. Now is the time to be a strong for you and your kids. All I see is your WW acting like an a$$hole and calling all the shots and you bending over backwards to meet her demands. Drop the rope with this one. Get rid of her and get on with your life. Everything you do from now on should concern only your well being and the well being of your kids. You deserve better. Let her do her thing. You've got a life to live and kids to take care of. You can do it. It gets better....
Me: 38 W:31 Kids: S16(mine from previous R), D10, S9, S4 M: 10 years T:12 years BD:Jan 3, 2018 W moved out: Apr 13,2018 Filed for D: Jun 2018 D final: Sep 2019