You're the sad in my song

You're the hand that waved goodbye you're the tears that fill my eyes
You're the love I had that went wrong
You're the lump that fills my throat and when I sing you're my blue note
And baby you're the sad in my song

I've often wondered why when people sing they cry
I didn't know that love could go wrong
But now I've sadly learned I'm among the hearts that yearn
Because darling you're the sad in my songs
[ dobro ]
You're the pain that's in my heart and you're the hours we spend apart
You're the sleep I never find all night long
You're the lips I used to kiss and you're the girl that I still miss
Darling you're the sad in my song

I've often wondered why...