The text cites longitudinal research concluding that the most powerful predictor of whether a couple will break up or stay together is:

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Longitudinal research has shown that the way a couple handles their differences is the most powerful predictor of whether they will break up or stay together. This includes factors such as communication, conflict resolution skills, and willingness to compromise. Violence, power dynamics, and decision-making are also important factors, but they are not as strongly linked to relationship success or failure as the way a couple handles their differences.

The Text Cites Longitudinal Research Concluding That the Most Powerful