I basically just watched a lot of youtube videos of Demi performing this song live and I
out what was being played. Usually a keyboard does the verse part, but it works to just
the chord on the guitar. I'm pretty sure this is right because it sounds good with the 
version. Enjoy :)

***some of the words might not be right because it's hard to hear what Demi is singing****

VERSE 1:
         E
Did you forget
            A
That I was even alive
          C#m
Did you forget
       B
Everything we ever had
         E
Now I'm left
     B
To forget
      E     B
About us
          E
Did you regret
          A
Ever standing by my side
          C#m
Did you forget
               B
What we were feeling inside
         E
Now I'm left
     B
To forget
      E      B
About us

CHORUS:
        C#m       E        B
But somewhere we went wrong
C#m      E       B
We were once so strong
      C#m    E      B
Our love is like a song
            C#m     E      B
You can't forget it

VERSE 2: (same chords as verse 1)
But now I guess
This is where we have to stand
Did you regret
Ever holding my hand
Never again
Please don't forget
Don't forget

We had it all
We were just about to fall
Even more in love
Than we were before
I won't forget
I won't forget
About us

CHORUS:
     C#m       E        B
But somewhere we went wrong
C#m      E       B
We were once so strong
     C#m    E      B
Our love is like a song
            C#m     E      B
You can't forget it

C#m     E   B
C#m     E   B

C#m       E        B
But somewhere we went wrong
C#m      E       B
We were once so strong
      C#m    E      B
Our love is like a song
            C#m     E      B
You can't forget it

VERSE 3: (same chords as other verses)
And at last
All the pictures have been burned
And all that's left
Is just a lesson we've learned
I won't forget
Please don't forget
About us

CHORUS:
     C#m       E      B
But somewhere we went wrong
     C#m     E     B
Our love is like a song
    C#m        E    B
But you won't sing along
          C#m
You've forgotten
      E
About us