What have researchers concluded about the relationship between marital interactions and marital happiness?

Question

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Researchers have found that couples who have negative interactions with each other, such as criticism or defensiveness, are more likely to have unhappy marriages. Positive interactions, such as expressing appreciation or validation, are important for maintaining a happy relationship. However, it is not necessary for the ratio of positive to negative interactions to be exactly 50:50. It is normal for couples to have occasional disagreements, as long as they are balanced by positive interactions. Love is also important in a marital relationship, but it is not the only factor that affects marital happiness.

What Have Researchers Concluded About the Relationship Between Marital Interactions