Qwerty_User_063 got that one first. It was Man Down by Rihanna.

  When tomorrow comes
I'll be on my own
Feeling frightened of
The things that I don't know
When tomorrow comes
Tomorrow comes
Tomorrow comes

And though the road is long
I look up to the sky
And in the dark I found, lost hope that I won't fly
And I sing along, I sing along, and I sing along

I got all I need when I got you and I
I look around me, and see a sweet life
I'm stuck in the dark but you're my __________
You're getting me, getting me, through the night
Kick start my heart when you shine it in my eyes
Can't lie, it's a sweet life
Stuck in the dark but you're my  __________
You're getting me, getting me, through the night
'Cause you're my  __________ (__________)
You're my __________  (__________), you're my ___________