OPINIONS PLEASE!!! RUNNING OUT OF TIME & NEED TO DECIDE!
This is absolutely nothing more than an opinion...
If my husband had left when things were at there worst, when I wanted him to go, it would have been easy for me to detach further from him and find something else. He stayed and just slept in his office most nights. We had some space and although I had an EA, I'm still here. Quite honestly, i feel like if he left now, it would hurt and I would cry, but I would get over it and move on. And I'm here! I can't imagine how much more detached she is.
Propose that you seperate yourselves within the house. Treat it as you would if you were elsewhere, like your own place and a time to work on you, but don't leave.
Not sure what excuse you'll use for wanting this, but it could be as simple as having the support of your kids and seeing them within the home will help you with your recovery. My FIL has 16 yrs clean and sober, so you'll get there and being with the kids will probably help. Stick with it and do it for you. So you can be the the strong good man that deep down, you truly are!
If i can't fall in love... I'd like to fall in chocolate! ~ Author Unknown