None of us understood what was happening to our spouses until we started reading up on MLC and depression and how it affects people. Each person is unique and so shall their crisis be unique.
Read as much as you can on MLC and also visit around this forum and read the threads. MLC is not a sprint, it's a marathon and the race won't be won today, tomorrow or even in the next year or so. It's a very long process for them because it has been building up for a long time.
The best advice I can give you is to take care of your finances, watch them closely, protect your assets, keep the focus on you and your family and remember...you have to take care of yourself first in order to help your family. You have no control over what he says or does, but you do have control over how you react to his behavior.
Continue to read and ask questions.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.