The chords repeated through the whole song are:
Am(x2), D(x2), G(x2), C(x1), Em(x1)
Repeat: (Am D G C Em)
Am D G C Em Am
Lover, will you look at me now?
D
I'm already dead to you
G C Em Am
But I'm inclined to explain to you what I could not before
D G
Whatever you didn't do, what you couldn't say
C Em Am
I am sorry that the worst has arrived
D
For I deserve more
G C Em Am
For at least I deserve the respect of a kiss goodbye
Repeat: (D G C Em Am)
Am D G C Em Am
Tell me, do you think of me now
D
As I think of you?
G C Em Am
For I could not have shaken the touch of your breath on my arm
D G
For it has stayed in me as an epithet
C Em Am
I am sorry that the worst has arrived
D
For I'm on the floor
G C Em Am
In the room where we made it our last touch of the night
[ Tab from: https://www.guitartabs.cc/tabs/s/sufjan_stevens/i_walked_crd.html ]
D G
I walked, because you walked
C Em Am
But I won't probably get very far
D G
Sensation to what you said
C Em Am
But I'm not about to expect something more
D G
I would not have run off
C Em Am
But I couldn't bear that it's me, it's my fault
D G
I should not be so lost
C Em Am
But I've got nothing left to love
Repeat: (D G C Em Am)
Am D G C Em Am
Lover, will you look from me now?
D
I'm already dead
G C Em Am
But I've come to explain why I left such a mess on the floor
D G
For when you went away I went crazy
C Em Am
I was wild with the breast of a dog
D
I ran through the night
G
With the knife in my chest
C Em Am
With the lust of your loveless life
D G
I walked, because you walked
C Em Am
But I won't probably get very far
D G
Sensation to what you said
C Em Am
But I'm not about to expect something more
D G
I would not have run off
C Em Am
But I couldn't bear that it's me, it's my fault
D G
I should not be so lost
C Em Am
But I've got nothing left to love
Repeat: (D G C Em Am)
D G C Em Am
I walked, because you walked x7