On choosing to stay with your partner, from Barry Schwartz's "The Paradox of Choice":

"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 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" (p. 229)