I'd go with something more like "I will not be in or part of a 3 person M, until you have NC with the OM we are not a family and I will not act like I am in one". When I have S, he will be with me and we will do our family time, I will contact you if there are any emergencies, but otherwise there will not be any updates on what we are doing.
M - 9 1/2 years 5/5/16 - Bomb drop - 3 week EA 10/31/16 - We sold house 01/10/18 - D Finalized