Linda, I really feel for you. Another way to look at it. If he doesn't want to stay around, then it's not worth trying. Why put the kids threw a very blah and unloved marriage? I know your thinking about the kids needing two parents and that is very kind and wonderful but sometimes things don't work that way. And sometimes it's better to have one parent, then to have two and one doesn't want the other one around. I guess what I'm trying to say, is do what is right for yourself and the kids, step in their shoes with what you know, and see if you'd want a Mom and Dad in the current state of your marriage or not.
And also can you cope with this right now? Feel free to vent, and also see counceling about this problem. There might be other ways to look at it, that your not seeing. Also start socking extra cash away in a personal savings account. If he stays you can use it for the kids. If he goes, you can use it for the kids and make sure they have what they need. This is mainly to help you and the kids, as when you get walked out on. It seems like everything in the world breaks as well and you got to pay to have it fixed. And its a royal pain to try to swing it from pay check to pay check and your kids are upset and you want to buy them things, and you can't even afford to buy them a happy meal. Really start putting money away, anything you can spare and cut back on spending, as when you fall you fall hard, and it takes a while to get money, from the courts etc. I would have gave anything for someone to tell me to put money away, or had enough brains to do it myself a few years ago. As it's hard to go from two pay checks to only one.
As the old saying goes, always prepare for the worst and hope for the best.
As your hubby may change his mind and decide to work things out, with depressed people they can easily go either way and you won't have to worry about that extra money, but if you do you'll at least got something to fall back on.
*hugs* Good luck and I truly wish you the best of luck in this,
Kit