Love is ultimately indefinable because it is a personal subjective experience. There is no sacred table by which we can measure if we’re already in love or not. We claim we are in love. In a way, we decide when we are in love.
Love at its most basic level is sexual. There must be a semblance of physical attraction to support the more nuanced areas of love. Sexual attraction is a stepping stone to reach the more advanced levels of the emotion.
A person is only able to rise above the mere physical when in love because society enables him to explore other features of the object of his love. Thus, for example, he can afford to fall in love with someone who lacks beauty but who is intelligent because society needs that sort of love to be more productive. Society needs intelligent people as much as it needs beautiful people. Society needs different forms of love so that different people can all hope to reach their own kind of love. Variety in love is useful to society because not all people are beautiful.
Love always defies our expectations in that it is never how we imagine it to be.
The object of your love, the other person, is not necessarily the best person you’ve met but she means so much anyway. We weigh the importance of people in our lives erratically when we’re in love.
We are full of errors when we are in love. We couldn’t care less.