Who co-wrote Taylor Swift 's " We are never ever getting back together " ?
April 4 - Justin Bieber 's single , " Boyfriend " , has the second - highest first week sales of a new single , debuting at # 2 on the Billboard Hot 100 , later on surpassed by Taylor Swift 's " We Are Never Ever Getting Back Together " with 623,000 sales making Bieber the third highest first week sale .