Why Does Love Feel Magical? It's an Evolutionary Advantage

Love letters written 4,000 years ago in Mesopotamia are remarkably similar to those written today, and although cultures differ in their stories and expectations about romantic love, the phenomenon appears to be virtually universal.

evolution may have created love as a biological lease agreement, both solving the commitment problem and providing an “intoxicating reward”

love may have primarily evolved because it supports sexual reproduction, love is of course still very much a part of life for gay, asexual and other people who do not sexually reproduce.