Sometimes love goes from sunshine to rain
I'm under this umbrella and I'm calling your name

from Justin Bieber – Heartbreaker Lyrics on Rap Genius

Meaning

Just like any given day can go from one extreme weather to another, love can fluctuate from euphoric to heartbreaking. Fights will always happen, but in the end if you have your umbrella (trust, dedication, and steadfastness), you’ll make it out of the rain.

This may also be a subtle nod to Rihanna’s “Umbrella,” as Bieber is a noted fan of Ri.

https://twitter.com/justinbieber/statuses/381913227061256193

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