I think you have gotten some very good and heartfelt advice here.
Please don't be too quick to throw in the towel.
I hate the thought of children losing a stable and loving home. Please sit down and have a direct and honest conversation about your feelings with your husband.
I'm going to be blunt. Put your happiness aside for just a moment. Would leaving your husband be in the BEST INTEREST of your children?
When it comes to divorce, the vast MAJORITY of kids really take it on the chin and the scars last a lifetime. Please be sure it would be worth the cost in the end.
Andee