I have seen this song performed live for acoustic and I'm pretty sure this is how he 
it

C/G (332010)
G   (320033)
Em  (022000)
F#m (x24432)
D   (000232)
Am  (002210)

CHORUS:
C/G (3x555x@1)           G (320003@1)           F#m (244222@1)     C/GYou (3x555x@1)know I'll wait forever, If I have time to
Am (x02210@1)        G (320003@1)              F#m (244222@1)       EmD
But I don't have forever, to wait for you yeah

C/G (3x555x@1)      G (320003@1)       F#m (244222@1)       C/GSo (3x555x@1)when I say I want, us to be together
Am (x02210@1)         G (320003@1)          F#m (244222@1)       Em (022000@1) DJust (xx0232@1)say you want me too and I'll be yours forever

C/G (3x555x@1)VERSE 1:
G (320003@1)    D (xx0232@1)           Em (022000@1)   DI (xx0232@1)could show you a place
G (320003@1)    D (xx0232@1)           Em (022000@1)       DYou've (xx0232@1)never been there before
G (320003@1)    D (xx0232@1)           Em (022000@1)   DI (xx0232@1)could show you the way
G (320003@1)    D (xx0232@1)           Em (022000@1)       DYou (xx0232@1)just can't go back no more

PRE-CHORUS:
Am (x02210@1)      Em (022000@1)        DI (xx0232@1)could make you excited     x2

VERSE 2,PRE-CHORUS, and CHORUS all the same notes, song ends on a held G

note: on the switch from the C/G chord to the Am in the chorus, he plays two transition 
that go like this:
e|------0--------------------0-----------------------------------------------|
B|------1--------------------1-----------------------------------------------|
G|------0--------------------2-----------------------------------------------|
D|------2--------------------2-----------------------------------------------|
A|------3------3------2------0-----------------------------------------------|
E|------3--------------------0-----------------------------------------------|