Mishka, I know you don't get much time for reading, but MLC really is just that - a crisis. They are not doing this on a whim. They are unhappy, confused, selifish and totally impossible, and there isn't a blind thing we can do, except make our own inward journey to the second half of our lives. Spiritual growth isn't made in a matter of days weeks, or even months. It takes a long time for us to change as well, and it is important that we keep on working on ourselves. If they do come out of it, we will have better marriages, and if they don't we will still be better people, which is what we really need to be, all of us.
This isn't a fashionable view, when most people are obsessed with materialistic happines, but deep spiritual content it a great gift. Right now you aren't there, but you are on the right road. Continue to plant your flowers, think kindly of your fellow men, as much as you can, and try and feel blessed whenever you feel a blessing. Yours is a hard road, but we are there for you.