The difference between a WAS and MLC is that the walk away has been telling you what is wrong for years and you didnt listen. In MLC there can be NO reasons, cause it is inside of them, and is really not a marriage issue, but the marriage is a casualty of the crisis.
So it is possible that you just dont know and that is it. And TBH like Rick said, even if you did know you more than likely could not FIX it.