Selena Gomez gained a boyfriend when she took troubled star Justin Bieber back, but a source close to the “Come & Get It” singer exclusively tells RadarOnline.com she lost a best friend.
Gomez has been long-time gal pals with Taylor Swift — who has stuck by her BFF through the on-again-off-again relationshipwith Bieber — but insiders reveal the “Red” singer has finally had enough and can’t stand by Gomez any longer if she stays with the Canadian pop star.