Brandy talks Kanye, Whitney and her first album in eight years
“The Boy Is Mine.”But the now 41-year-old singer digs into deeper emotional territory on her haunting new single, “Borderline,” which examines the mental-health side effects of an unrequited love.“I loved someone that was not available to be loved by me, and so that drove me crazy,” Brandy told The Post about the song, whose video, depicting the straitjacketed star in a padded room, ends with the words, “You are not alone!” in a PSA.