"
for you, in your darkest times
I was there for you, in your darkest nights
But I wonder where were you?
When I was at my worst down on my knees
And you said you had my back
So I wonder where were you?
When all the roads
He says that he was always there for this girl, in her darkest times, as he put it. And now she is gone when he needs her the most and he does not understand. She even told him that she would have his back and all he does is wonder where she is.