This song is "Breathe Again" by the American singer-songwriter and musician Sara Bareilles. If you know nothing about Sara, she was born in Eureka, California in 1979 and has been creating beautiful music as far back as 2002. This song has to be one of the saddest songs I have heard in a long while. I added words and punctuation in red to the lyrics below to make the lyrics easier to understand.

Hear It: https://www.youtube.com/watch?v=v2yPU5WPwZs

Lyrics:

The Car is parked, and my bags are packed
But what kind of heart doesn't look back
At the comfortable glow from the porch--
The one I will still call yours?

All those words came undone
And now I'm not the only one
Facing the ghosts that decide
If the fire inside still burns.

All I have, and all I need.
He's the air I would kill to breathe.
He Holds my love in his hands
And Still I'm searching for something.
Being Out of breath, I am left hoping someday
I'll breathe again, I'll breathe again

I Open up next to you
And my secrets become your truth
And the distance between
That was sheltering me comes in full view.

I Hang my head, and break my heart
That was Built from all I have torn apart
And my burden to bear
Is a love I can't carry anymore

All I have, and all I need.
He's the air I would kill to breathe.
He Holds my love in his hands
And Still I'm searching for something.
Being Out of breath, I am left hoping someday
I'll breathe again, I'll breathe again

It hurts to be here.
I only wanted love from you.
It hurts to be here.
What am I gonna do?

All I have, all I need
He's the air I would kill to breathe.
He Holds my love in his hands
And Still I'm searching

All I have, all I need
He's the air I would kill to breathe.
He Holds my love in his hands
And still I'm searching for something.
Being Out of breath, I am left hoping someday

I'll breathe again, I'll breathe again
I'll breathe again, I'll breathe again
I'll breathe again, I'll breathe again