SCh, Believe none of what they say and only half of what they do. This is such good advice as it keeps you from being sucked into their drama. As soon as you do something they said they wanted it changes. You can never win, so the best thing to do is not even try.
Stay focused on yourself and your children as your H is not even close to being done. Live your life within your own boundaries and don't concern yourself with his. Just protect yourself.
Depression and MLC fog are what drives them. He's spinning so fast trying to fix himself. He moves from one thing to another trying to escape the pain. When he burns himself out he may stop to examine his real issues. Those things inside that have sent him on this journey. We can only pray that this happens sooner or later.