Justin Bieber allegedly hooks up with Barbara Palvin in November 2012. (Courtesy of Twitter/Getty)
Justin tells Selena he misses her after a Dec. 2012 ski trip with Taylor Swift and Harry Styles!(Courtesy of Twitter/Getty)
Selena sings a revenge song to Justin Bieber! (Courtesy of Twitter/Splashnews)
Justin and Selena are back at it in an Instagram pic. (Courtesy of Instagram)
Justin parties with women until 6 a.m. in May 2013!(Fameflynet/Getty)
Justin and Selena celebrate the Fourth of July together. (Courtesy of Instagram)
Selena tells Ryan Seacrest she’s single in a July 2013 interview. (Courtesy of E!/Instagram)