Science says she really doesn't it like it when you do that. LouLou & Tummie/ImageZoo/Corbis hide caption

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Phillip Underwood and Michelle Sheridan and their children, Logan and Lilliana, gather in their living room in Frederick, Md., after a long day of work and school. The couple had delayed marriage, in part for financial reasons. James Clark/NPR hide caption

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Katherine Streeter for NPR

Having a special someone won't fend off depression if that person doesn't have your back. hide caption

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