Polk, Thanks for the post on my thread. After reading your's I do agree there seem to be a lot of similarities.
Some things she said to me in a recent converstation that might help.
She often resented how patient / stubborn / dedicated I was to sticking with the R, but this also made it difficult for her to just walk away. She thanked me for this.
She was thankful that we didn't completely separate. We also shared the same bed through the S. I can't speak for the other side, but we both agreed after having gone through what we have that a separation would be counter productive.
Don't under any circumstance give her permission to go. My W told me that if I had done this, it would have taken the burden of choice off of her.
Hope this helps some. I'm sure others will throw in their support.