This song by Rihanna is a powerful ballad about the intense and overwhelming feeling of love. It speaks to the power of love and how it can consume us, even when we try to deny it. The lyrics explore the idea of being in love and how it can take over our thoughts
From Wikipedia
"Love on the Brain" is a song by the Barbadian singer Rihanna. It was released on 27 September 2016 by Westbury Road and Roc Nation as the fourth single from her eighth album, Anti (2016). Written by Joseph Angel and producer Fred Ball, "Love on the Brain" is a 1950s-and-1960s-inspired doo-wop and soul ballad. The production incorporates an orchestra consisting of guitar arpeggio, organ, and syncopated strings. The lyrics are about the highs and lows of a toxic love.