Still, it is encouraged on every front. Venerated by society, and financially subsidized by the state. Yet when its failing, very little good advice available. I've found most marriage counseling to be very unhelpful. Designed to save something (that maybe be shouldn't be saved) with really weak aphorisms that don't get to the psychological depths needed to explore WHY we do the things we do, attract and even unconsciously desire chaos and failure, etc..
But married couples too often lose the fact that it's about the relationship first. More important than the house, the cars, even the kids. People forget that everything started with two people and two people only. They stop having compassion and being kind to one another. They stop having sex (so important), that feeds the relationship. The relationship is a living thing. If you starve it, it dies.