[W]e should make an effort to limit how much we think about the attractive features of options we reject. - Barry Schwartz

Agonizing over whether your love is "the real thing" or your sexual relationship above or below par, and wondering whether you could have done better is a prescription for misery. Knowing that you've made a decision choice that you will not reverse allows you to pour your energy into improving the relationship that you have rather than constantly second-guessing it.

[W]e must decide which choices in our lives really matter and focus our time and energy there, letting many other opportunities pass us by.

There was a time when I was a boy when you could get any kind of telephone service you wanted as long as it came from Ma Bell. You rented your phone, you didn't buy it. Once consequence of that... is that the phone never broke.