B means the German B, i.e. Bflat. "G..." means the same sequence as in the first line.
That's the way I once wrote it down for myself. I hope it will be useful for anyone.

Tainted Love 
    G5     B5  Eb5        B5 C5       
Sometimes I feel I've got to
G5    B5     Eb5        B5 C5
     Run away I've got to
G5    B5     Eb5             B5 C5           G5            B5 
     Get away from the pain that you drive into the heart of me
     G...                  G...
The love we share seems to go nowhere
          G...                 G5                      B5  
And I' ve lost my light for I toss and turn I can't sleep at night 

G5
     Once I ran to you (I ran to you)
B5
     Now I'll run from you
Eb5
     This tainted love you've given
   C5
I give you all a boy could give you
D5
Take my tears and that's not nearly all
G...
      Tainted love
G...
Oh... Tainted love 
G...                     G...                        G...
Now I know I've got to       run away I've got to         get away
           G5               B5
You don't really want any more from me
    G...
To make things right
              G...
You need someone to hold you tight
          G...    
And you think love is to pray
         G5             B5
But I'm sorry I don't pray that way 

Once I ran to you (I ran)
Now I'll run from you
This tainted love you've given
I give you all a boy could give you
Take my tears and that's not nearly all
Oh...tainted love
Tainted love 
       G... 
Don't touch me please
          G...
I cannot stand the way you tease
   G...
I love you though you hurt me so
         G5                B5
Now I'm going to pack my things and go
G...                                   G...
       Tainted love, tainted love...      Touch me baby, tainted love...