Being in love is entirely irrational, so one ought never to judge someone by who he's in love with, rather, only by his friends.
in the Middle Ages, being lovesick was a considered real disease, caused by humoral imbalance
Being in love shows up in brain scans like an addiction, not an emotion.
Being in love is characterized by the complete indifference of other people it produces.
Being in love makes you a less productive person
Couples in love can synchronize their heartbeats by simply gazing into each others eyes.
What do you call two birds in love?Tweethearts
Being in love is a pathological variant of loving. It is an addiction, obsession marked by the exclusion of others, an insatiable demand for presence, and paralysis of other interests and activities.

How did one mitten feel about the other mitten?He was in glove with her
Being in love is not the same as loving. You can be in love with a woman and still hate her.