My response to my H has been "The decision to separate is yours alone, but the business of separating should be done together. Carry on with your plans and I'll handle my own expectations. I will help with whatever information or cooperation you need from me." I'm accepting of his decision, but have made it clear that it's not a mutual one. I also feel strongly about protecting myself and my son, so I am happy to work with him on the legalities of the separation. Would something like that work for you?