MLCers will vanish from your life for a long while. They cannot handle pressure so they up and leave the home. Their coping skills breakdown hence the slow downward spiral that your H is experiencing now. He's now in the tunnel and he'll need to figure out a way out. You cannot force him out of it. Just let him be and go about your business.
I know that all of this is hard on you and the kids. It is HIM, not you. He's temporarily broken at the moment. Your real H is buried deep inside the gunk he's going through now.
Have you read my threads over in the MLC forum (A Voyage into the MLCer Mind)? It has some insights of the MLC experience with other posters chiming in with stories on their MLCer. You may find it helpful.