Slight correction to the tab here. (The Bm cord was left out mostly)  The song is 
played with a capo on the first fret if you want to play it like the record.  But it's easier 
sing if you don't.  (And most of us aren't Cassidy)

D                     A Bm
Heard you talk about leaving
D                     A Bm      D
Heard you talk about leaving before
D                     Bm          G
Heard you talk about giving up on me.

D                     A Bm
Heard you talk about changing
D                        A Bm              D
But talk is cheap and I've heard it all before
D                    Bm
Used to be that I'd fall apart
     G                 A
But that don't work no more

     F#m                  Bm
'Cuz you can't leave half way
    F#m              G A
And I can't let you stay

D                   A
Take your promise take your pain
Bm                 G
Take your restless heart
       D              A               G
If you go, go all the way, don't look back
  D                            A
'Cuz in my heart you've been gone so long
       Bm                  G
that I won't miss you that bad
        D               A               G
If you go, go all the way, don't look back

D                           A Bm
So you ask me why I'm not crying
D             A Bm       D
I did all my crying before
        D           Bm
I took off my pity party dress and
          G        A
I don't dance no more

F#m                  Bm
I don't need someone else
F#m               G A
To make me feel myself

D                  A
Take your promise take your pain
Bm                    G
Take your restless heart
       D               A               G
If you go, go all the way, don't look back
  D                           A
'Cuz in my heart you've been gone so long
Bm                         G
that I won't miss you that bad
        D              A               G
If you go, go all the way, don't look back
        D              A               Em  A
If you go, go all the way, don't look back
           Em A             Em A
Don't look back, don't look back

D                  A
Take your promise take your pain
Bm                    G
Take your restless heart
        D              A                G
If you go, go all the way, don't look back
 D                             A
'Cuz in my heart you've been gone so long
        Bm                  G
that I won't miss you that bad
        D              A               G
If you go, go all the way, don't look back
        D              A               G
If you go, go all the way, don't look back
        D              A               G
If you go, go all the way, don't look back