Starts with:

You say that you're going/but you're already gone
I can tell by/the look in your eyes;
For just 3 days apart/we're preparing ourselves
For the moment/we say our goodbyes.

[Chorus] So let me down/easy and slow
Kiss me once/'fore you leave don't ya know
I've spent years/on my own


Never felt so alone/as I do now, whenever you go. ...
I keep thinking Robin & Linda Williams but if that's the case, I must have the title wrong as I can't find it! It's a duet, for sure, done in 3/4 time. Help! TIA