First tab :P

Capo on 5th fret

Intro:

E-----2-0-2-----2-0-2s-7-5-2-5-0-----0-|
B-0-3---------3------------------3-0---|
G-----------3--------------------------|
D--------------------------------------|
A--------------------------------------|
E--------------------------------------|

Instead of the last 3 notes you can play G, F#

First verse:

BmWe (x24432@1)must be shrewd or stupid,
G (320003@1)         F#One (244322@1)of the two,
BmThe (x24432@1)Stakes are too important,
G (320003@1)       F#For (244322@1)us to lose,
BmBut (x24432@1)he would have broke your heart,
G (320003@1)                F#But (244322@1)she would have lead me down the garden,
BmThey (x24432@1)would always leave,
G (320003@1)          F#Early (244322@1)in the morning,
GNo (320003@1)final kiss,
F# (244322@1)             GF#
No final warning,

Chorus:

BmJust (x24432@1)as we're friends today,
G (320003@1)               F#Tomorrow (244322@1)we'll be lovers,
Bm (x24432@1)                 G (320003@1)      F#Never (244322@1)to be the same no more, no more,
BmWe've (x24432@1)crossed the Rubicon,
    G (320003@1)               F#And (244322@1)we can't turn our heels,
BmSo (x24432@1)it's onto the breach,
         G (320003@1)               F#Oh (244322@1)we'll have to teach ourselves, my love,

2nd Verse:

BmAnd (x24432@1)I'll be telling tales,
   G (320003@1)            F#If (244322@1)I, claim to be sure,
BmThat (x24432@1)this will last forever,
     G (320003@1)                    F#Just (244322@1)look at the way it has gone before,
    BmBut (x24432@1)he would have broke your heart,
    G (320003@1)            F#And (244322@1)she would have taken me for granted,
Bm (x24432@1)                    G (320003@1)          F#They (244322@1)would always leave early in the morning,
GNo (320003@1)final kiss,
F# (244322@1)         GF#
No final warning

Chorus:

BmJust (x24432@1)as we're friends today,
G (320003@1)               F#Tomorrow (244322@1)we'll be lovers,
Bm (x24432@1)                 G (320003@1)    F#Never (244322@1)to be the same no more,
BmWe've (x24432@1)crossed the Rubicon,
    G (320003@1)               F#And (244322@1)we can't turn our heels,
BmSo (x24432@1)it's onto the breach,
                          G (320003@1)        F#Oh (244322@1)we'll have to teach ourselves, my love.

I'm pretty sure that there is another chord within the song but i can't figure it out. 
melody line played by the lead guitar in the second chorus is similar to the intro but 
a different ending which i haven't worked out yet.