They end relationships too early because of a cognitive error called the transition rule. As behavioral economists Daniel Kahneman and Amos Tversky explained, when we estimate how something will feel in the future, we tend to focus on the initial impact. For example, you might imagine that lottery winners end up extremely happy, but it turns out that’s incorrect: As I mentioned earlier in the book, a year after they win, lottery winners are about as happy (or unhappy) as non–lottery winners.
