True intimacy starts with comfort in your own sense of self. If you like yourself and feel comfortable, you’ll be able to relate in a real and genuine way with another person. The “capacity to be alone” implies choice. You may want to be with someone, but you don’t have to be with someone because you fear that being alone leaves you without stability or value. Couples often report that when they’re apart from each other during the course of the day, they think more positively and romantically about each other than at any other time. Neurochemistry supports this idea, finding that separation actually revs up dopamine and epinephrine, the hormones associated with sexual desire.
Read the entire article here: An Asset to Couple Intimacy: The Capacity “To Be Alone”