Maybe you have this one, but I just heard it on the country oldies station:
TILL THE RIVERS ALL RUN DRY
© Don Williams / Wayland Holyfield
Universal Polygram International Publishing Inc.
Till the rivers all run dry
Till the sun falls from the sky
Till life on earth is through
I’ll be needing you
I know sometimes you may wonder
From little things I say and do
But there’s no need for you to wonder
If I need you, ‘cause I’ll need you
Too many times I don’t tell you
Too many things get in the way
And even though sometimes I hurt you
Still you show me, in every way