I would also like to add that had you found a way to stop his crisis, he would have picked up where he left off in the crisis at a later date and the crisis would have been far worse.
People who go through a mlc are destined to have them, some are full blown and others are a blip on the radar screen. Those who have full blown crisis situations are those who never learned the proper coping skills as children growing up. There is nothing you could have done to stop his crisis. AD's just take the edge off the depressive feelings, but they would still have continued on the mlc path. Counseling will not work because they go one or two times and hear what they want to hear and also to appease the spouses and then cease going. This is an internal war raging within them and unfortunately it began when they were children, long before we came into the picture.
The only cure for mlc is to allow them to go through the entire crisis. What the finished product will be is anyone's guess.
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.