I would have to say something to my friends. After what I have gone through and knowing the pain it causes the children, LBS and their families. I would have to try and explain to them that it would be worth trying, really trying, to explain the way they are feeling to their H's and seek counseling.
I know I didn't work hard enough on my M. That is something that I will always regret. I wasn't given the chance to work on it, my H just walked out and never looked back. If I had a chance to possibly stop this from happening to another family I would do it in a heartbeat.
I know it would not be an easy conversation to have with your friend. I also know that a lot of time someone's mind is made up before they talk about it.
But you just said yourself
"How much I wish I could have done something before! How much I wish the couple people I know that my h confided in just before walking out - how much I wish they had said something that might have prompted him to try one more time to break through!"