They are like teenagers, they think they know it all. Their brain is scrambled like a bunch of twisted wires. They will try anything and everything to find relief from their emotional pain. MLC is all about depression and emotions. They know deep down that something is wrong, but they can't put their finger on what the problem is. Thus, they think it is the marriage/relationship and you. It is not you at all, but them.
Continue to focus on you and what you can do to survive. BTW, he will pop out of his rabbit hole periodically just to check to see if you are still there. It's very common with them.
Hang in there! This is not a sprint, but a super long run.
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.
