This is my first chords by hear so they can sound fine to me, and not for you.

Intro: D 

or

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D
I threw all of your stuff away
A
And then I cleared up my head
Em
I took you out of my heart
G
And ignore all your messages

D
I tell everyone what we got threw
A
'Cause I'm so much better without you
Em                           G
But it's just another pretty lie 'cause I break down
Em                   G
Everytime you come around
O Oh O Oh

Chorus:
D
So how I did you get here, under my skin
A
Swore that I never let you back in
Em
Should've known better
                      G
I'm trying to let you go
So here we go go go again

D
You never say what you want
A
And you never say what you mean
Em
But I start to go insane
G
Every time that you look at me

D
You only hear half of what I say
A
And you're always showing up too late
Em
And I know that I should say goodbye but there is no use
G
Can't be with or without you
O Oh O Oh

Chorus:
D
So how I did you get here, under my skin
A
Swore that I never let you back in
Em
Should've known better
                      G
I'm trying to let you go
So here we go go go again
D
Hard as I try I know I can't slip
A
Something about you is so addictive
Em
We're falling together
                        G
I think that by now I'd know
                         Em  G   Em   A  
'Cause here we go go go agaaaain (agaaain)

Em
And again
G
And again
A
And agaaain

(now strum soft)
D
I threw all of your stuff away
A
And then I cleared you out of my head
Em                       G (strum harder again)
And I took you out of my heart!
O Oh O Oh

Chorus:
D
So how I did you get here, under my skin
A
Swore that I never let you back in
Em
Should've known better
                      G
I'm trying to let you go
So here we go go go again
D
Hard as I try I know I can't slip
A
Something about you is so addictive
Em
We're falling together
                        G
I think that by now I'd know
'Cause here we go go go again

D        A
Again... Again...
Em
Should've known better
                      G
I'm trying to let you go
'cause here we go go go again

A         Em        G
And again and again and again and again
A         Em        G
And again and again and again and again
A         Em        G                  D
And again and again and again and again