A friend says he's been playing this song for years, but doesn't know the title or who originally sang it. Anyone recognise it?

It ain't easy but I'm making it without you.
Day by day I'm just playing it by ear.
It ain't easy cause I'm still mad about you.
Come on home and I'll make it up to you.
Once you said there would never be another but another's gain is just this poor fool's loss.

Tried Google with no luck