Don't be so quick to give up, this IS MLC, after all, and the OW is an addiction/band aid/diversion from his pain.
There are some people that have to see the door literally closing on them before they will scurry inside...and it has not even been a day since you made it clear to him that you'll not contact him as long as OW is in the picture.
Back away, and allow God to work on him, Mila...things can change in the blink of an eye, even in MLC.
One day at a time, one step at a time...TIME to watch things is a huge factor in MLC, no guarantees, only time, and continuing on your journey.
It's up to you as to how you want to do things, it was always up to you.
I felt like I was drowning in a sea of sorrow, and things didn't look right, smell right or taste right at that time for me.
Stay open to your intuition, it's already strong enough that you know things that you'd never known before.
Get on with your life AS IF he's not coming back, and hold firm for now....you'll actually know when there is a shift/change within the situation; I always knew when things changed.
Stay dark, and take things one day at a time.
Understand things can go either way, and accept that whatever will happen, is going to happen; your husband has the ball in HIS court at this point.
Wait and watch, GAL....you will know when things take a shift for better or for worse.
Don't make ANY major decisions while under emotional duress...you have nothing but TIME at this point, so, there's no hurry to do anything to further cut him off.
Take care..I can tell you nothing else..it's in the hands of God at this point.
Remember, as each person is different, every MLC/Transition is different..what works for one may not work for another. Most of the time it is trial and error for ALL involved.