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Accentuate the Positive.

Scientific American:

In the past few years psychologists have discovered that thriving couples accentuate the positive in life more than those who languish or split do. They not only cope well during hardship but also celebrate the happy moments and work to build more of these into their lives.

Psychology Today:

The experiences of the 56 participating couples who divorced showed that loss of initial levels of love and affection, rather than conflict, was the most salient predictor of distress and divorce. This loss sends the relationship into a downward spiral, leading to increased bickering and fighting, and to the collapse of the union.

“This ought to change the way we think about the early roots of what goes wrong in marriage,” Huston said. “The dominant approach has been to work with couples to resolve conflict, but it should focus on preserving the positive feelings. That’s a very important take-home lesson.”