Credit to youtuber Huu aka lunazian, check out his cover
of this song for some reference if you'd like: http://youtu.be/OJpj7Bkn77s
This is more of an acoustic version, anyways, same 5 chords throughout the song:

Em: 022000
Bm7:x24232 
Bbm7:x13121
Am7:x02010
C:  x32010
D6: x5403x (I think this one's called a D6, not sure)

[Intro]

Em, Bm7,Bbm7,Am7,C,D6

[Verse 1]

Em (022000@1)         Bm7I (x20202@1)know what you did

Am7 (x02010@1)  CD6
I know

Em (022000@1)          Bm7So (x20202@1)I'ma let you taste hurt

Am7I (x02010@1)ain't washing my sins
 
                    C (x32010@1) D6I (xx04xx@1)ain't washing my sins

[Pre-Chorus]
                 EmNow (022000@1)we're lying about the nights

Bm7Hiding (x20202@1)it all behind the smiles

Am7 (x02010@1)        CD6
Take a look at what you did

EmYou (022000@1)probably thought that you'd break my heart
 
                                 Bm7You (x20202@1)probably thought that you'd make me cry

Am7But (x02010@1)baby it's okay

C  D6
I swear it's okay

[Chorus]

Em (022000@1)                Bm7'Cause (x20202@1)I know everything (eh eh eh eh)

Am7 (x02010@1)      CD6
I know everything

Em (022000@1)       Bm7I (x20202@1)know everything

Am7 (x02010@1)      CD6
I know everything

[Bridge]

Em (022000@1)                      Bm7Now (x20202@1)these talks don't twist like they did before

Am7It's (x02010@1)hard to keep you up

C (x32010@1)   D6And (xx04xx@1)you are crying

EmBut (022000@1)baby it don't hurt

Bm7Oh, (x20202@1)like you thought it would

Am7 (x02010@1)                CD6
The more of you the merrier

[Pre-Chorus]

EmNow (022000@1)we're lying about the nights

Bm7Hiding (x20202@1)it all behind the smiles

Am7 (x02010@1)        CD6
Take a look at what you did

EmYou (022000@1)probably thought that you'd break my heart
 
                                 Bm7You (x20202@1)probably thought that you'd make me cry

Am7But (x02010@1)baby it's okay

C  D6
I swear it's okay

[Chorus]

Em (022000@1)                Bm7'Cause (x20202@1)I know everything (eh eh eh eh)

Am7 (x02010@1)      CD6
I know everything

Em (022000@1)       Bm7I (x20202@1)know everything

Am7 (x02010@1)      CD6
I know everything