I'm almost positive that these are the right chords, the timing is a little tricky but 
it's easy once you get it

Verse: piano

She just walked away
Why didn't she tell me?
And where do I go tonight
This isn't happening to me
Tis can't be happening to me
She didn't say a word
Just walked away

Chorus: guitar

Em           Bm
You were the first to say
             C
That we were not okay
Em           Bm
You were the first to lie
C            D
When we were not alright
Em          Bm
This was my first love
            C
She was the first to go
D            Em
And when she left me for you
C         D
I was the last to know

Verse: piano

Why didn't she tell me
Where to go tonight
She didn't say a word
She just walked away

Chorus: guitar

Em           Bm
You were the first to say
             C
That we were not okay
Em           Bm
You were the first to lie
C            D
When we were not alright
Em          Bm
This was my first love
            C
She was the first to go
D            Em
And when she left me for you
C         D
I was the last to know

(bridge)  F, Am, F, Am

Chorus: guitar

D           Em
I'll be the first to say
C        D
That now I'm okay
            Em
And for the first time
C           D
I've opened up my eyes
Em          Bm
This was my worst love
              C
You'll be the first to go
D            Em
And when she leaves you for dead
C             D
You'll be the last to know
Em           Bm
I'll be the first to say
         C
That now I'm okay
D           Em
And for the first time
C           D
I've opened up my eyes
Em          Bm
This was my worst love
              C
You'll be the first to go
D            Em
And when she leaves you for dead
C             D
You'll be the last to know

(end on an E minor chord)