K no both answers are stupid I know the beadles and they both decided to break up cause he was going away to live his dream and perform all across the world and quote justin "I couldn't give her the time she deserves"
They broke up because justin bieber was going on tour and could be with her at the same time and since he couldnt give her what she deserved they both decided to break up
Beacause, Justin Bieber was so busy with his tour that he could not give her the time that she deserved. So they broke up. Justin broke up with her so she could get with a guy that had time to actually spend with her.