Writer(s): gordon/warren Darling, I'm so blue without you I think about you the live-long day When you ask me if I'm lonely Then I only have 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 ev'ry 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 You'll never know just how much I miss you You'll never know just how much I care You said good-bye, no stars in the sky refuse to shine Take it from me, it's no fun to be alone With moonlight and memories
https://primanota.net/frank-sinatra/youll-never-know-lyrics.htm