Sweeney:

I wanted you to know that I love the way you laugh
I wanna hold you high and steal your pain away
I keep your photograph and I know it serves me well
I wanna hold you high and steal your pain

Sweeney wanted to tell Nellie It was just the biggest mistake he ever made that he cheated on her
he just loved the way she Laughed
he just wanted to take all her pain away
Sweeney kept the photograph he had of Nellie
because it made him feel good

Cause I'm broken when I am lonesome
And I don't feel right when you're gone away

Sweeney was just so broken up inside
and he was lonesome
and felt alone when Nellie wasn't around

You've gone away, you don't feel me here anymore

Since Nellie left him, he didn't feel her there anymore

Nellie:

The worst is over now and we can breath again
I wanna hold you high, you steal my pain away
There's so much left to learn, and no one left to fight
I wanna hold you high and steal your pain

Nellie was looking out of the window
the worst was over now
she could breathe again
Nellie wanted to hold Sweeney high and steal his pain away
there were still so much things to Learn and not to fight
she wanted to steal Sweeney's Pain away

Cause I'm broken when I am open
And I don't feel like I am strong enough
Cause I'm broken when I am lonesome
And I don't feel right when you're gone away

Nellie was always careful with opening up towards someone
it was just so hard because they always broke her hart
Nellie thought she wasn't strong enough
because she was just so lonesome
since Sweeney was gone

Both:

Cause I'm broken when I am open
And I don't feel right, though I am strong enough
Cause I'm broken when I am lonesome
And I don't feel right when you're gone away

They were both broken
they knew what the other one felt
they only felt right when they were together
Then they weren't Lonesome any more

Cause I'm broken when I'm lonesome
And I don't feel right when you're gone

You've gone away, you don't feel me anymore