These are the chords Cameron uses. The end chorus has finger plucking that I didn't put 
here. But this is the video you can get it from if you watch closley.
http://www.youtube.com/watch?v=cUhlAtVCovo

No capo.

Chords used-
G - 320033
Cadd9 - x32033
Lets call this 'X' (not sure of the chord name)- 200033
D- xx0232
Em7 - x22033
A7sus4 - 002033

Intro-
G, X, Cadd9, G, X, Cadd9

Verse-

G                     X
You dropped your coat by the door
Cadd9                            G
I ran outside to watch you drive away
X    Cadd9
From me
G
And in my eyes
X
They won't believe
Cadd9                            G X Cadd9
My heart is trying desperately to beat
D                             Cadd9
And lately I'm speeding up my breathing
D                                Cadd9
My hands are shaking all the time

Chorus-

Em7            Cadd9         G   D
'Cause I don't wanna let you go
Em7              Cadd9        G      D
I can't sleep or breathe when I'm alone
Em7                Cadd9   G   D
If I could just go back in time
A7sus4
I wouldn't make the same mistakes
           Cadd9                G  X  Cadd9 G X Cadd9
If I could just go back in time

Verse 2-

G           X
Looking at what we wrote
   Cadd9
In old postcards
                 G      X    Cadd9  G
And counting the times you'd repeat yourself
           X
And I just wanna hold
Cadd9            G
You know I just, I just can't let you go
X             Cadd9
[I just can't let you go...]

Chorus-

Em7            Cadd9         G   D
'Cause I don't wanna let you go
Em7              Cadd9        G      D
I can't sleep or breathe when I'm alone
Em7                Cadd9   G   D
If I could just go back in time
A7sus4
I wouldn't make the same mistakes
           Cadd9
If I could just go back in time
           A7sus4                            Cadd9
I wouldn't make the same mistakes if I could just go back in time