So heress the easiest and probably the rightest way to play this song.
Hope you enjoy it!

Am (x02210@1) Bbm (x13321@1)C (x32010@1) C# (x43121@1)G (320003@1) Dm (xx0231@1)Ebm (xx4342@1)-x-  -x- -x- -x- -x- -x- -x-
-1-  -0- -1- -3- -0- -3- -3-
-2-  -2- -0- -0- -0- -2- -0-
-2-  -2- -2- -2- -0- -0- -0-
-0-  -0- -3- -3- -0- -0- -0-
-0-  -0- -0- -0- -2- -0- -0-
-x-  -x- -x- -x- -x- -x- -x-

(note : Am# C# and Dm# are called here "intermediate chords")

Prelude : (every written chord is one string play from up to down).
Am (x02210@1)Am (x02210@1)Am (x02210@1)Am (x02210@1)Am (x02210@1)Am (x02210@1)Bbm (x13321@1)Bbm (x13321@1)C (x32010@1) C (x32010@1) C (x32010@1) C (x32010@1) C (x32010@1) C (x32010@1) C# (x43121@1) C#G   G (320003@1) G (320003@1) G (320003@1) G (320003@1) G (320003@1) G (320003@1)  GDm Dm (xx0231@1)Dm (xx0231@1)Dm (xx0231@1)EbmEbm  Dm (xx0231@1)Dm (xx0231@1)Dm (xx0231@1)    AmIn (x02210@1)this farewell
           CTheres (x32010@1)no blood
           GTheres (320003@1)no alibi
Dm (xx0231@1)              AmCause (x02210@1)I ve drawn regret
         CFrom (x32010@1)the truth
     GOf (320003@1)a thousand lies

[Pre-Chorus]
Dm (xx0231@1)         AmSo (x02210@1)let mercy come
   C (x32010@1)    GAnd (320003@1)wash away
Dm (xx0231@1)      Am (x02210@1)   BbmWhat (x13321@1)I ve done

[Chorus](with the "intermediate" chords)
     C (x32010@1)        C#I (x43121@1)ll face myself
G (320003@1)               DmEbm Am (x02210@1) BbmTo (x13321@1)cross out what i ve become
C (x32010@1)        C#Erase (x43121@1)myself
G (320003@1)           Dm (xx0231@1)Ebm (xx4342@1) AmAnd (x02210@1)let go of what i ve done

C (x32010@1)Put to rest
         GWhat (320003@1)you thought of me
Dm (xx0231@1)               AmWhile (x02210@1)I clean this slate
         C (x32010@1)        GWith (320003@1)the hands of uncertainty

[Pre-Chorus]

[Chorus]

For what I ve done
I start again
And whatever pain may come
Today this ends
I m forgiving what I ve done!!!

[Chorus]

What I ve done
Forgiving what I ve done