Experts weigh in on the psychology of romantic regret:

Whether it's related to romance or not, regret is a near-universal human feeling, according to author Daniel Pink. For his book on that subject, Pink collected thousands of lovelorn anecdotes from people who say they wish they'd done things differently — sometimes, in relationships or missed connections that happened many years ago. Correspondent Susan Spencer chats with Pink, author Deborah Copaken and The New Yorker's art critic Jackson Arn.

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