If my W asks where I'm going (which I expect she will), what is the response I should give her in our current state of S but cordialness within the same house?
"Going out, don't wait up". "Not really sure where all I may decide to go.....or do. See ya". "Haven't you heard? We are separated. That means you don't get answers to personal questions". . (Use the last one at your own risk of bodily injury).
How about just shaking your head (showing amusement), and say, "Bye".
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!