Here are the on-again, off-again couples who caught our attention (and caused our eyes to roll) during the year.
Justin Bieber and Selena Gomez
For being so young, these two have been together for a surprisingly long time. After several years of dating, Selena Gomez said goodbye to her boyfriend, Justin Bieber, in November.
Sources said she had trust issues with her man (JB had been hanging out...