You can fall in and out of love every day, and experience the benefits of brief moments of “positivity resonance,” just by being open to other people. Via the Atlantic:
Psychologist Barbara Fredrickson, a leading researcher of positive emotions, presents scientific evidence that love is not what we think it is. It is not a long-lasting yearning and passion that characterizes young love or sustains a marriage; and it is not the blood-tie of kinship.
Rather, it is what she calls a “micro-moment of positivity resonance.” She means that love is a connection, characterized by a flood of positive emotions, which you share with another person—any other person—whom you happen to connect with in the course of your day. You can experience these micro-moments with your romantic partner, child, or close friend. But you can also fall in love, however momentarily, with a stranger on the street, a colleague at work, or an attendant at a grocery store.