The stages of MLC are a guide, not set in stone. Each person is unique, therefore, their crisis will be unique. Some display similar traits, but because their childhoods are very different, they will act out differently. Keep in mind that depression is the main element of his crisis and he will be emotional as well.
About the stages, they are out there to give you an idea of what they do. The traits and the lengths of time will vary. Some go through the crisis quickly and others will be slow, i.e., like turtles. They tend to bounce back and fourth in the first 4 stages and some even bounce around until the very final stage which is actually acceptance. When he has finally completed his journey, he will reconnect with all in the exact opposite of how he entered his crisis.
From what I am reading, I would say he is going to be going out with the man who is going through a divorce. They tend to hang out with people who are separating/divorcing or already divorced. They like to hang out with single people as well. Right now, he is going back in time to the teen and/or early 20's years.
As for your finances, you may want to consider setting up a separate account just for your use. Invest in some gift cards just in case he decides that he is going to go on a spending spree. You will need to have a nest egg in case that happens.
Make a list of questions for a lawyer, but do not share the info with your H. Also, do not share anything that you read about MLC, especially the stages and this site. All of this information is for you, the lbs. You will not be able to convince him that he is in crisis. Yes, he has an inkling something is wrong, but it is going to take him a long time to figure it out. He will hit that brick wall many times over and until one day, he will tire and finally sit down and contemplate his life. Some never do this.
Do be sure to visit the other threads on the forum. They will help you along the way.
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.