Selena Gomez broke up with Justin Bieber because she does not appreciate the "Boyfriend" singer's friendship with her ex Nick Jonas, a source close to the former Disney star said.

Gomez, 20, was not seen at Bieber's Dec. 15 Jingle Ball concert in Chicago, which only fueled the already circulating rumors of a breakup between the singers. A source "VERY close to Selena" told HollywoodLife.com, which broke the news on Sunday, that Gomez decided to end the relationship because of her ex-boyfriend Nick Jonas and his involvement with Bieber, 18.

"At this point, Selena isn't going to any of Justin's concerts ever again. She doesn't want to speak to him anymore and told him it's over," the source said. "Hanging out with Nick proved that he wants to just be a jerk about this, and Selena's sick of being heartbroken. They are finished, and I think it's for good this time."

Jonas and Bieber spent some time together on Dec. 13 and the source added that "Selena was crying about it."

Bieber tweeted that he won several pingpong games while hanging out with Nick Jonas, who then replied, "Just played #Justin Bieber in ping pong. Went to deuce both times, but he's the ping pong champion."

A second source also confirmed to the website that Gomez and Bieber broke up, though Jonas' connection was not noted. 

Gomez and Bieber locked hands at an American Music Awards afterparty in November, a week after they were rumored to have broken up. Gomez was holding on to the singer's arm as they were photographed talking to his mother Pattie Mallette at the JW Marriott in Los Angeles. Yahoo reported that they came to the party together and later went back to Gomez's L.A. home.

Jenny McCarthy - who playfully kissed Bieber during the AMAs when he went on stage to receive one of his awards - was also at the party and posted her sighting on Twitter: "My cub @justinbeiber brought his acceptable and beautifully aged beauty Selena to the AMA after party. Guess I'm back on the prowl. Rww!"