The singer and rapper pulled the plug on their approximately two-year relationship because of busy work schedules, multiple outlets reported Wednesday.
They appeared cosy backstage last month at Coachella, where Grande performed. But that's apparently not the case anymore.
Miller and Grande's romance spanned a difficult time for the "No Tears Left To Cry" pop star. She performed at a May 2017 concert in Manchester, England, where 22 were killed in a terrorist bomb attack. The next month, Miller took the stage with Grande at a benefit for the victims and their families.
TMZ, citing unnamed sources, reported that Grande and Miller remain close friends.
Grande's first studio album since the Manchester bombing, "Sweetener", is due out sometime in the next three months.