Another broken family

Walking around the neighborhood last night I heard the telltale sound, "Bye Daddy! We love you!" in front of a house I knew was home to several polite blond children. On a Wednesday night, that can only mean one thing. Sure enough, the kids jumped out and ran up the steps into the house, and the man drove away with a somber face. Another pending divorce with standard custody arrangement of  Mom and kids staying in the house and Dad relegated to Wednesday dinners. So sad. And all too common on this block and I suspect many blocks in our town, in our state, in our country. Why do people let it go so far? Why don't they nurture their relationship before it is beyond repair? Thinking back, I remember this Dad playing with the kids, but gradually showing more and more stress. It is a shame that he did not .....what? what is the solution America? Why do some couples make it?