Selena Gomez is furious with Justin Bieber

Selena Gomez is allegedly furious Justin Bieber has befriended her ex-boyfriend.

The Love You Like A Love Song singer is said to be "devastated" that her 18-year-old Canadian boyfriend has become good pals with Nick Jonas, 20, and refused to attend his concert in Chicago on Saturday because of their blossoming friendship.

A source close to the 20-year-old popstar told HollywoodLife.com, "Justin and Nick Jonas hung out all night. Selena was crying about it. He wouldn't even return her calls when she found out and called him up."

Selena was previously reported to be devastated following her split from 'The Jonas Brothers' star in 2010 after one year together and earlier this year she hit out Nick for forcing her to keep their relationship hidden.

She said, "I was in a relationship previously where I had to hide everything and it wasn't my choice. I had to go through different exits and take separate cars and do the craziest things, and it just really wasn't worth it. It was like a year of my life completely wasted."
Justin and Nick spent time together recently in the studio where Justin is recording new music, and have even tweeted about their friendly table tennis rivalry.

On Friday, Justin wrote, "In the studio tonight working on the acoustic album...had some solid ping pong matches but... still #pingpongchampion," just hours after Nick posted a message on his timeline that said: "Just played @justinbieber in ping pong. Went to deuce both times, but he's the ping ping champion. #Igotyounexttime : )"

According to friends close to Selena, they think she should dump Justin because he constantly upsets her.

One insider said, "This is why they should break up. She keeps trying and she's heartbroken. It's not working."