I agree. I have long thought your H was up to *something* and was on the divorce track without deviation when he felt you were ready. And my WAS was equally (if not more) staunch with his intentions from day 1 and now, 24 months later he is living with OW.
I would certainly tell him his stuff needs to be out by next week, you would like to have his co-parenting plan by xx date and let him know you have begun to pursue what you need to pursue to protect yourself and the children. I would also tell him you will be working with a psych to fine tune the post divorce co-parenting plan and he is welcome to join you if he likes. If he asks why now I would be brief and upfront and let him know that you no longer care to be married to somebody that treats you poorly.
Honestly, I wouldn't expect your H too feel too much of a crises. This is what he has asked for and wanted all along. The only small bit of crises he might feel is you striking first which I am sure was not in his WAS plan. Otherwise I really do not feel it will strike him as critical unless his finances will be greatly altered.
