This is just a very simple way of playing the song.
I'm not positive about the pre-chorus or bridge.

Intro/Chorus:
She's not it...
          F     C     G     C     (x4)


Verse:
You know I'm glad that she's not alive...
F            C         G         C       (X 4)

Pre-Chorus:
But you know me, I will do what I gotta do, in spite of you...
             Am         C               F            Dm    (x2)

...Miserably
   F

CHORUS:
(See Intro)

2nd verse (Same as first)

Bridge:
Cause I'm leaving
          Am
I'm Leaving
    C
And I just can't help these
      F
Just can't help these feelings
                      G
I'm still breathing
          Am
No more deceiving 
          C
And I just can't help these
      F
Just can't help these feelings
                      Dm

CHORUS (x2)


Enjoy.