I think you handled that pretty well. I believe what is happening is that your W is becoming very uncomfortable with your detaching. I think this is normal and it is what should be happening. I would guess that she will become more confused and maybe in not so great a mood as you continue to detach. Stay the course. And I don't see anything wrong with repeating that you need space as you are hurting and need to adjust to this situation.
You can tell your W that some maniacal woman from the midwest sent out a voodoo curse to all WAS who ever cheated on their mates. No amount of light energy is gonna zap it. This is a serious curse which can only be lifted when WAS matures to age 6 (at the minimum)
You are doing a good job. Hang in there.
Have a very happy new year.
Spitfire
Always do right. This will gratify some people, and astonish the rest. Mark Twain