When I gave my H the Plan B letter I told him I was detaching from him because I was starting to hate him and wanted to preserve what love I still had left for him.
Not a DB principle but the Plan B is basically a road map home with boundaries if things turn to dust with the OW.
Actually, I think Plan B sounds kind of like LRT which is a DB principle and going NC exactly for the reasons you describe. Preserving the love you feel, plus stopping the pursuit of the WAS so they stop running away from you.
Happy Valentine's Day, PM!!! Hope you're having a good one. I'll be fine when it's over though!!! Karen