I don't recommend that you try to keep the marriage together because of what Gargoyle posted, but please don't ignore the information that he posted--

No matter how hard it seems for you, it is worse for the children-remember that they didn't decide that they couldn't continue living with either of you, and the only world that they know is going to be ripped apart--no matter how much you think they understand, they will have no way of preparing for the pain that they will feel, and keep inside--also remember that they will blame themselves--

Look very carefully at the problems mentioned in Gargoyle's post--chances are, you will have to deal with at least one of them, and probably more, over the next few years--