While the couple surpassed plenty of expectations staying together more than year, those close to the pair say the relationship is constantly on the rocks due to Selena's incessant jealousy issues.
"Selena can be so dramatic about Justin's exes, who aren't even in her league! They both engage in really petty arguments and it's killing their relationship," a friend of the pair told RadarOnline.com.
While they threaten to break-up constantly, the Biebs has fallen pretty hard and "can't imagine" life without her, which some say the Spring Breakers actress abuses.
"Justin's heart is with Selena because she's his first true love, but Selena is pretty much just riding out the relationship because she knows he's good for her image," the insider reported. "Let's just say that if for some reason Justin's star ever fell, Selena would drop him immediately."
The silver lining? A powerful and poetic Justin Bieber album all about the perils of grown-up heartbreak. Just think of the music videos!