So this song is really pretty to play. You can use normal tuning or tune your 
guitar to match what the strings are on here.

So tune your strings to D,G,C,F,A,D

Then the chords are:
Em,G,F,C

Strumming pattern(VERSE)is:
D,D,U,U,D,U,U,D,U,U,D,U,U

strumming pattern (CHORUS) is:
D,D,U,D,U

INTRO:
strum each chord twice slowly

Here you are:

Em
You got your secrets locked inside so well
G
I'm gonna break down your walls
And find out what you won't tell

F 
You think you've coined the slogan, the master in disguise
C
Let's cut right through the bullshit
I see all of your lies


Em            G
You took your love and wasted all of it
F                   C
On someone who could care less for you
Em        G
I kept my word, everything I said
F                     C
Came directly from my heart, it's true


Em                  G
Don't think I won't forget the things you've done
F                     C
Don't think you won't regret forbidden fun
Em                      G
I've drawn my line with you in the sand
F                     C                    Em 
Right now you are the one who is unforgiven


G        F   C  Em 
Unforgiven!
G        F   C  
Unforgiven!


Em
You walked me to the gates of heaven
G
Now I'm burning in hell
F
Took something pure and true
C
And turned it into something to sell


Em          G
How can you live with yourself
F                         C             
Each time you think about what you've done?


Em            G
You took your love and wasted all of it
F                   C
On someone who could care less for you
Em        G
I kept my word, everything I said
F                     C
Came directly from my heart, it's true


Em                  G
Don't think I won't forget the things you've done
F                     C
Don't think you won't regret forbidden fun
Em                      G
I've drawn my line with you in the sand
F                     C                    
Right now you are the one who is unforgiven


Em          G        F            C
You had you fun with all that was forbidden
Em          G          F          C
You are the one who is unforgiven


Em            G
You took your love and wasted all of it
F                   C
On someone who could care less for you
Em        G
I kept my word, everything I said
F                     C
Came directly from my heart, it's true

Em         G
Let it go, just let go
F         C
You'll be fine on your own
Em         G
Let it go, just let go
F         G
You'll be fine on your own