The couple called it quits after about two years of on-off dating.
"I've been through a lot the past few months. It's been weird and sad and cool," UsMagazine.com reported Gomez, 20, said at a private benefit concert for UNICEF. "This song definitely speaks to me."
UsMagazine.com said Bieber has also sung the song at concerts.
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PARIS, June 18 (UPI) --MBDA's Meteor air-to-air missile is to be integrated onto Eurofighter Typhoon fighters, complementing missile systems already used by the aircraft.