"I don't have a boyfriend and haven't been on any dates recently," the 25-year-old pop star said.
The couple split several years ago before rekindling their romance in July 2010. Despite their breakup, the "Judas" singer credits Carl, a musician and bartender, for helping her become "successful" in the music industry.
"I've really never loved anyone like I loved him. Or like I love him," she told Rolling Stone last year. "That relationship really shaped me. I sort of resolved that if you can't have the guy of your dreams, there are other ways to give love."