"when this all started a few months ago, you asked for time and space. I have given you that. Since then, you have made no meaningful effort to end your A...and shown no indication that you are interested in working on our marriage...even though I have made it clear that I am willing to do so. So, now it's me that needs time and space. I can no longer share a bed with you since you continue to see/contact OM. I will move your things out of the room and bathroom and I ask you to respect my space going forward."
That's a speech! I see you are definitely a member of the Wordy Family. I'm your cousin Sandi.
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!