This song is so beautiful, sorry if I may have got the words wrong!
Just sort of hold the chord shapes and play the arpeggios (:

Also, I'm not sure if it is techically called B/G but for that chord play this:
200003

Into: G

C (x32010@1)      D (xx0232@1)         GIf (320003@1)I gave you my heart
C (x32010@1)      D (xx0232@1)         GTo (320003@1)wear upon your arm
C (x32010@1)       D (xx0232@1)       G (320003@1)     B/G (31333x@1)    EmWould (022000@1)you lend me all your scars to bear? 
  Am (x02210@1)        DI (xx0232@1)swear I'm here

G (320003@1)   D (xx0232@1)     EmAnd (022000@1)never take it off
 G (320003@1)   D (xx0232@1)     EmNever (022000@1)take it off
            C (x32010@1)      D (xx0232@1)       GCause (320003@1)we're all tied up in knots

Outro: G D Em Em C D G