What is going on in their heads?

[Mozza]

I know that no relationship is perfect on either side, but no matter what I may have done wrong, nothing justified this outcome in my situation.

Yes, I feel the same and this feeling has been echoed several times here. I also just had a realization today that might be relevant to your situation: the reason they might come back is not the past, it's the future of the R. No matter the beautiful moments, if our spouses don't see more of them in the future, they won't come back. That's why one of the DB principles is:

3. Do not point out good points in marriage or try to get him/her to read marriage books, look at your M pictures, etc.

So work on ways to create more beautiful moments in the future by working on yourself, by becoming a better person.

Good luck with the move. It will be difficult. I'll have a thought for you tomorrow.