I'm sorry this happened to you; it's very difficult. My H did the same thing in 2004. He simply left while I was at work. I personally think it's very cowardly. In my H's case though, the person he admires most in the world is the deadbeat dad who abandoned their family when he was about 9. Walking away is being like dad.
My H did end up coming back, but the issues were still there. I begged him to come back, which probably didn't help our situation any. We had been to a counselor both before and after this. Somehow we lasted another year before he moved out again on July 1st. This time it was a relief when he left, and I haven't had any contact with him.
You may want to try the "Separated..." thread. There are people going through this, and some have been successful in rebuilding their marriages.
I believe my H is in MLC. He just turned 40. He also has no sense of responsibility and only wants to have fun. We don't have kids, and I've had to force him to contribute financially (minimally only) over the last few years. I started saying "No" in terms of covering everything financial last year and kept doing it this year to protect myself financially. I wasn't "fun" anymore, so he started chasing 20 somethings...even registered on date.com as a 25-year old divorced man.
