The other version is most certainly not right, so here is a closer one
at least.  STANDARD TUNING

Inrto x 2:  G B7 C D7 (end on a final G strum before the pause for verse)

G       B7            C                  D7
I had a moment when I thought I might be wrong,
    G      B7           C        D7
But Ashley how could it be?
G               B7      C         D7
I waited on the rooftop all night long,
    G           B7         C       D7
But you weren't coming for me.
B7                              C
And now I'm sitting here like a mixed up little kid
B7                         C
You said you wanted me but you never did
G          B7        C                    D7
There was a moment I thought our love was strong,
    G        C         G
But now that moment is gone.

G                   B7             C              D7
I could stand right underneath the window of your room,
G              B7           C            D7
Throwing rocks I've done it before
G                   B7               C               D7
And I would love to find a reason to dazzle you with lies,
    G                B7        C         D7
But I don't have the energy no more.
B7                                   C
And you never promised anything that you didn't give,
B7                               C
I assumed that you'd say yes but you never did.
G           B7        C                D7
There was a moment my love for you was strong,
    G        C         G      G        C    
     G
but now that moment is gone.  Now that moment is gone.

G, C (strum each chord a few times fast and hard before the lines with just
vocals)

I saw you behind the camera whispering
                    C        G   C   G    C 
   C
to your friends and watching me
C
I fell in love with you there was proved the
                C     G    C     G   C     C
fool that I can often be

C  G   C   G    C  (This hard strumming 
C, G pattern continues for a while,
you will have to listen to get this down cause.
Below is the little horn thingy that's playing over the middle C,G stuff
e-------------------------------------------------|
B-------------------------------------------------|
G-------------------------------------------------|
D-0h2-0-5--0h2-0-5-0h2-0--------------------------|
A------------------------3--3--3------------------|
E-------------------------------------------------|

G       B7            C                  D
I had a moment when I thought I might be right,
    G      B7           C           D
But Ashley how could it be?
G            B7                      C               D
I drank your sherry bourbon thinking you might come around,
      G                    B7          C        D
There ain't no one on this rooftop but me.
B7                              C
And now I'm sitting here like a mixed up little kid,
B7                         C
You said you wanted me but you never did.
G           B7        C                D
There was a moment my love for you was strong,
    G           C         G
But Ashley that moment is gone
G           C         G       F#/G
Ashley that moment is gone.
Em       C         G
Now that moment is gone.

That should be pretty damn close.  I may have misplaced a chord name here
or there but follow the pattern of the rest if I messed up.  It is a pretty
simple, and awesome, song.  Enjoy.