People choose to remain married because they want companionship, sex, financial security, family ties, extended family, someone with whom to share responsibilities, a person to grow old with, a preference to share life as opposed to going it alone and so on. If one of the reasons people choose to remain together is for the sake of the kids, I say, "Bravo." That's great.
The bottom line is this: We only have one go-around, and we all deserve happiness. No one should plan on simply acquiescing to a life of misery. Having said that, given the miraculous changes I've seen in couples' relationships, even in the 11th hour, I feel like a psychotic optimist.
You don't have to just stay together for the sake of the kids; get happy for the sake of the kids! It will be a gift for a lifetime.
Author of Divorce Busting and The Sex-Starved Marriage
Founder of www.divorcebusting.com