The couple had flown to Mexico to celebrate New Year’s Eve together but before the two could ring in 2013, they had an argument that caused them to go separate ways, the source said.
The 20-year-old actress flew out of Mexico on December 30, while the Canadian crooner opted to leave the following day, the New York Daily News reported.
The source said that the couple are yet to see each other since their fight, but added that it would not be correct to characterize the split as a final breakup.
The 18-year-old singer’s relationship with the Disney starlet has been on thin ice since November, when they first called it quits.
The couple have tried to make things work, however, stress from the pair’s relationship appears to be taking a toll on Bieber’s career.
An insider had earlier said that Gomez had been giving Bieber a really hard time by partying without him, which was driving him crazy.