I just want to hit on some points that you commented on above. The first is something AS talks about all the time and that you are probably never going to understand what happened. I am not even sure WWs know for sure why they are choosing this path. They have to believe in some way life we will be better. The next point is the fixable comment. Again I think all the LBS feel the same way. In my case my ex and I were still physically attracted to one another, enjoyed the same things, financially set for life etc. We just didn't know how to meet each other's needs. By the time I realized we were in crisis mode she was done and didn't want to try anymore. I feel good in the fact that once I knew we were in trouble I gave everything I could to save my marriage. You will get there too.
Last comment is have you thought about moving back in until the house sells to save on money?