“Breaking Up” Is A New Wave-Influenced Track Which Is One Long List Of Reasons Why Her Ex Sucks. It’s The Third Single From "Sucker". It Was Originally Debuted Live In A Texas Concert Alongside London Queen. She Also Performed It On Her First Headlining Tour. According To Songfacts In An Interview With NME XCX Discusses The Semi-Regret She Has While Singing It "That Song Is Really Brutal – Every Time I Sing It I Feel Bad For Everyone Of My Ex-Boyfriends. … I Feel Like I’m Making All The Guys I Ever Dated Cry."