Artist: Kelly Willis
Song Title: Sincerely (Too Late to Turn Back Now)
I could tell you I came by to say hello
But I knew good and well
That you weren't home

Now these lines I write
Will reach you by midnight
Tell you that it's over, anyhow
Sincerely, too late to turn back now

Blue words on white paper find a way
To say what I'm not strong enough to say
If I stay to say goodbye
Someone's bound to cry

And I don't think that
I can stand to hear that sound
Sincerely, too late turn back now

I don't need to sign my name
Cause you know me by now
And I won't have to take the blame
When tears come falling down

I just ain't got the heart to hang around
Sincerely, too late to turn back now
P.S. I guess I let you down

From http://www.lyrics007.com