disappointment quotes

Unrequited love may be painful, but it is safely painful because it does not involve inflicting damage on anyone but oneself, a private pain that is as bitter-sweet as it is self-induced. But as soon as love is reciprocated, one must be prepared to give up the passivity of simply being hurt to take on the responsibility of perpetrating hurt oneself.”― Alain de Botton
Have you ever wondered what’s the psychology behind unrequited love? What is it that makes people fall in love with people who could never like them back?