Unrequited love is a familiar feeling—the ache of loving someone who doesn’t love you back. All kinds of unrequited love can be painful, but some cut deeper than the rest. Unrequited love is a familiar feeling—the ache of loving someone who doesn’t love you back. All kinds of unrequited love can be painful, but some cut deeper than the rest. Science, /science, Innovation, /innovation, Science, /science, standard