Capo 2 

The 1st part is just the keyboards, but you could play along with it with the following chords.

Verse 1:

So what if I came clean, I told you all you mean to me
So what if I meant every word I said, baby don't let it go to your head
G                                Em
So what if I write your name because you're always on my brain
C                              Am
In a heart I paint it crimson red, baby don't let it go to your head
Em B  Am                            Em B          C             D
      Don't be getting any big ideas       Let me make it clear

Chorus:
Em           G
Just cause I can't go on
D
Just cause I die when you're gone
Em           G                D                           Em
Just cause I think of you in bed, don't let it go to your head
             G
If I looked in your eyes
D
1,2, too many times 
Em             G              D
and memorized every word you said, don't let it go to your head

Verse 2:
G
So what if I want to kiss
Em
from your toes up to your lips
C                                 Am                          Em  B
It don't mean that you've had me yet, you're gonna be good I bet
Am                             Em  B           C        D
I'm the one who's in control here      Let me make it clear

(chorus)
Em G   D                                  Em  G  D
      ooohhhhhh don't let it go to your head     ooohhhhhhh

Bridge:

I had a porcelain doll

I held on to it so tightly, but when it broke 
                                          Em                          G
I swore I'd never hold onto something so tightly again, don't let it go to your head  
D
oohhh no ooh no noo

(no chords)

Just cause I can't go on

Just cause I die when you're gone

Just cause I think of you in bed, don't let it go to your head

guitar solo or play chorus chords

(chorus)play chords until the end.