Love at first sight is a physical and emotional impossibility. Because, as I've indicated before, love is much more than a romantic feeling. It is more than a sexual attraction, or the thrill of the chase, or a desire to marry someone. The primary difference between romantic excitement and real love is where the emphasis lies.
Infatuation tends to be very selfish in nature.
I must be in love. Notice that he's not talking about the other person. He's excited about his own gratification. Genuine love, by contrast, is an expression of the deepest appreciation for another human being. It is an awareness of his or her needs and strengths and character.