What is commonly called 'falling in love' is in most cases an intensification of egoic wanting and needing. You become addicted to another person, or rather to your image of that person. It has nothing to do with true love, which contains no wanting whatsoever.
Eckhart Tolle (2006). “A New Earth (Oprah #61): Awakening to Your Life's Purpose”, p.66, Penguin