If you want you can play the B, Bm and C#m chords with an open high E string
i.e 

B              C#m
 | -0- |           | -0- | 
 | -3- |           | -5- | 
 | -4- |           | -6- | 
 | -4- |           | -6- | 
 | -2- |           | -4- | 
 | -x- |           | -x- | 


Intro
E   B   C#m   A5
E   B   C#m   A5

E                   B  
 Can't believe your packin your bags
C#m             A5
  Tryin so hard not to cry
E                      B
 Had the best time and now its the worst time
C#m             A5
 But we have to say goodbye

B
 Don't promise that you're gonna write
       F#m
Though promise that you'll call
B                                      A
 Just promise that you won't forget we had it all

               E            Bm
Cause you were mine for the Summer
       D               A5
Now we know its nearly over
           E          Bm
Feels like snow in September
      D              A5
But I always will remember
         E Bm       A5   E
You were my Summer love
                   E Bm       A5
You always will be my Summer love

E                   B   
 Wish that we could be alone now
C#m                    A5
 If we could find some place to hide
E                   B
 Make the last time just like the first time
C#m            A5
 Push a button and rewind

B
Don't say the word that's on your lips
      F#m
Don't look at me that way
B
 Just promise you'll remember
         A
When the tide is grey

               E            Bm
Cause you were mine for the Summer
       D               A5
Now we know its nearly over
           E          Bm
Feels like snow in September
      D              A5
But I always will remember
         E Bm       A5   E
You were my Summer love
                   E Bm       A5
You always will be my Summer love

          B
So please don't make this any harder
   C#m
We can't take this any farther
    A5                                  A5
And I know there's nothin that I wanna change, change


               E            Bm
Cause you were mine for the Summer
       D               A5
Now we know its nearly over
           E          Bm
Feels like snow in September
      D              A5
But I always will remember
         E Bm       A5   E
You were my Summer love
                   E Bm       A5  E
You always will be my Summer love
                   E Bm       A5  E
You always will be my Summer love
                   E Bm       A5
You always will be my Summer love