Get out. I mean, i'm not expert by far at anything to do with marriage. But you're obviously not happy. Does the idea of counselling sound appealing at all, or would it be any help? You sound as if you're beyond still hoping for things to work out, and you know when you've lost that kind of hope, you need to leave, or separate yourself.
How old are your children? I mean, if they're a bit older, you'd do all right. What about alimony etc? I mean wouldn't he still be able to support you for a short while until you can get on your own two feet?
Do something to make yourself happy, that's what's worth living for. Your children will understand at some point or another. Best wishes Ngdawg, take care of yourself
*hugs*