It was over, until you walked away
Like it was nothing baby

from Justin Bieber – Bad Day Lyrics on Rap Genius

Meaning

Although Selena and Justin dated off and on — with quite a bit of off time, from JB’s point of view, she bailed out quick without caring. She literally forgot forever, and you can tell by this interview post-breakup she did with Letterman where she admits to hurting him.

https://www.youtube.com/watch?v=_Ghe_b7Y_M8

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