Instrumental:  : Gm : Gm : Gm : Gm :
               : Eb : Eb : Eb : Eb :
               : Gm : Gm : Gm : Gm :
               : Eb : Eb : Eb : Eb :
               : Cm : Cm : Cm : Cm :
               : Gm : Gm : F  : F  :
               : Cm : Cm : Cm : Cm :
               : Gm : Gm : F  : F  :
               : Cm : Cm : Eb : F  : Gm (let ring)

from now on I write the chords resulting from the bass and guitar part together.
Bass plays G A Bb C, guitar keeps arpeggiating on Gm 3553xx (or 3103xx?).

Gm Am Bb           Cm             Gm Am Bb          Cm
        Countless times I trusted you,    I let you back in
        Gm         Am       Bb             Cm                 Gm Am Bb    Cm
        Knowing... yearning... you know I should have run but I, I stayed

Gm F Cm          Bb     Gm       F
        Maybe I always knew
     Cm             Bb             Gm  F  Cm  Bb      Gm F Cm Bb
        My fragile dreams would be broken for you

Gm Am Bb        Cm           Gm  Am           Bb          Cm
        Today I introduced myself  to my own feelings
     Gm           Am    Bb                 Cm                    Gm Am Bb                 Cm
        In silent agony,  after all these years, they spoke to me...      after all these years

Gm F Cm          Bb     Gm       F
        Maybe I always knew
     Cm             Bb             Gm  F  Cm  Bb      Gm F Eb F
        My fragile dreams would be broken for you

instrumental:  : Gm : Gm : Gm : Gm :
               : Eb : Eb : Eb : Eb :
               : Gm : Gm : Gm : Gm :
               : Eb : Eb : Eb : Eb :
               : Cm : Cm : Cm : Cm :
               : Gm : Gm : F  : F  :
               : Cm : Cm : Cm : Cm :
               : Gm : Gm : F  : F  :
               : Cm : Cm : Eb : F  : Gm (let ring)

in the instrumental part, "Gm" means to alternate Gm and Gsus4, while
                          "Eb"  ...  ..    ...    Eb ...  Eb6.

Gsus4 is 355533, Eb6 is x65543.

playing the song with a capo on the 3rd fret makes it easier.

the guitar riff is essentially made of two slighly different repeating figures:

:----------------------:
:-----------3-----3----:
:.-5----3-5---3-----3-.: over Gm
:.--------------------.:
:----------------------:
:----------------------:

:----------------------:
:-----------3-----3----:
:.-5----3-5---------3-.: over Eb and Cm
:.------------5-------.:
:----------------------:
:----------------------:

the only relevant variation, played over the F chord:

:----------------------:
:----------------------:
:--5-3-2----5-3-2------:
:--------5--------5-3--:
:----------------------:
:----------------------: