I am proud of you!! You have been strong for so long, continue to hang in there. I understand that you are sad, but really what more could you have done? Even in these last few months as you have been waiting to sell, even after he had that email incident, he could have turned things around and worked on the marriage. Most men at least have sense enough to PRETEND that they are trying to do better, but this fool just doesnt care. He has not nearly put as much effort in as you have and because of that, it just wont work.
Be sad, take note of what you will do differently next time, release yourself of this burden, and dont look back! You have put everything on the line personally, financially, and emotionally for this man. It is now time for you to take those things back for your sake and your daughter's. Stay strong, take it one day at a time, and PRAY!