I feel like it expresses the sadness and the epicness of Gus and Hazel's relationship. The lyrics, I thought, switched perspective from Gus to Hazel, like I labelled below. The song basically makes me want to cry...
"All I want is nothing more
To hear you knocking at my door
'cause if i could see your face once more
I could die as a happy man I'm sure"
"When you said your last goodbye
I died a little bit inside
I lay in tears in bed all night
Alone without you by my side
But If you loved me
Why did you leave me?"
"'cause you brought out the best of me
A part of me I'd never seen
You took my soul wiped it clean
Our love was made for movie screens"