I have a hard time seeing how anyone would fight for someone that doesn't want to be with them. However, with that said, I have incredible respect for those that move past it, heal and restore their marriages. But... If you notice, the ones that do so have a spouse w/a common behavior... They are incredibly remorseful and sorry. The LBS didn't sit and wait to be considered attractive again. They acted, on their own path, and didn't ride the roller coaster.
This has been my observation as well. Tremendously so.