The song is based on a poem written by a young Oklahoma war bride named Dorothy Fern Norris.
The song was introduced in the 1943 movie Hello, Frisco, Hello where it was sung by Alice Faye. The song won the 1943 Academy Award for Best Original Song, one of nine nominated songs that year. It was also performed by Faye in the 1944 film Four Jills in a Jeep.
The song is often credited as Faye's signature song. However, Faye never released a record of the ballad, and frequent later recordings of the song by other singers diminished her association with it.
As performed by ALICE FAYE in the film "Hello Frisco, Hello":
Oh, Darling, I'm so blue without you I think about you the livelong day When you ask me if I'm lonely Then I have only this to say
You'll never know just how much I miss you You'll never know just how much I care And if I tried, I still couldn't hide my love for you You ought to know, for haven't I told you so A million or more times
You went away and my heart went with you I speak your name in my every prayer If there is some other way to prove that I love you I swear I don't know how You'll never know if you don't know now
If there is some other way to prove that I love you I swear I don't know how You'll never know if you don't know now