This are the (hopefully) decent chords that make up this beautiful song.
While it does sound more authentic on piano, the chords for guitar should do nicely. 
This will also definitely strengthen your bar chord technique, since this relies heavily on it.

Intro: Db F# Db F#   (These, along with the rest of the entire song, are slow and very rubato. 
Listen to the song to get an idea of when the chords change.)


Db                     F#m
Cold feet, don't fail me now.

Db            F#m-F#
So much left to do.

Db                                    F#
If I should run ten thousand miles home,

              F#m
Would you be there?



Db                  F#m
Just a taste of things to come.

Db        F#
I still smile.

                

              Db       Ab  F#
But I don't wanna die alone.

       Db       Ab  F#
I don't wanna die alone,

       Ab
Way before my time.



Short Interlude (Same as the Intro): Db F# Db F#



Db                   F#m
Keep calm and carry on.

Db                      F#
No worse for the wear.


        Db       Ab  F#
I don't wanna die alone.

        Db       Ab  F#
I don't wanna die alone,

          Ab
Way before my time.


Ebm      Fm
Is it any wonder?

Ebm               Fm
All this empty air.

Ebm                        F#
I'm drowning in the laughter,

Ab 
Way before my time has come.


Outro:    Db F# Db F#
           Db Ab F#
           Db Ab F#
           Ab
           Db

Hope you guys enjoy this! Please comment to add suggestions, if needed.