No I didn't think you would let me down
That easy
Oh no girl
And I didn't think

from Justin Bieber – Bad Day Lyrics on Rap Genius

Meaning

All of the chaos and rumors of Jelena in the past year were so unexpected for him. He thought he’d have his girl forever and he didn’t understand why they ended so fast. Bieber didn’t expect Selena to just give up so quickly on him, he thought she’d give someone she spent so long with a chance.

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