Some stars cannot be best friends forever. Find out why these former celebrity BFFs are no longer pals, including Kim Kardashian and Paris Hilton's disintegration of friendship due to jealousy issues, Jill Zarin and Bethenny Frankel's nasty falling out on reality TV, and more!
Selena Gomez and Demi Lovato
The once inseparable BFFs reportedly grew apart when Gomez befriended country star Taylor Swift. When Lovato was asked in January 2010 if she was still close to her Princess Protection Program costar, she shot back coldly: "Ask Taylor."