I figured this out by ear, so there is probably some mistakes.
http://justkait.com/


         F#               C#
Didn't know what I was doing
             
           Eb            B
'Take it slow' didn't apply
               
          F#                   C#
Knock me out the moment I saw you

           Eb                 B
This is wrong but feels so right

             B
When do I let it go?

                F#
You gave me a heart shaped bruise

               C#
Guess I'm not over you

          Eb
Baby it hurts so good
 
               B
More than it really should
            
               F#
You gave me a heart shaped bruise

               C#
Guess I'm not over you

          Eb
Baby it hurts so good
 
               B
More than it really should
          
         F#                   C#
Didn't think, it was already too late
     
           Eb           B
You hit me on my blind side

         F#
Hold on tight

         C#
It's a bumpy ride

            Eb                      B
Should've thought before I let it slide

        B
But do I let it go?


                F#
You gave me a heart shaped bruise

               C#
Guess I'm not over you

          Eb
Baby it hurts so good
 
               B
More than it really should
            
               F#
You gave me a heart shaped bruise

               C#
Guess I'm not over you

          Eb
Baby it hurts so good
 
               B
More than it really should

   C#                            Eb
I think that I'm in trouble, a piece without a puzzle 

   Ab                    F#
I don't know who, could see what's true

C#                       Eb                 B
Whats the answer baby, maybe I'm just crazy over you


                F#
You gave me a heart shaped bruise

               C#
Guess I'm not over you

          Eb
Baby it hurts so good
 
               B
More than it really should
            
               F#
You gave me a heart shaped bruise

               C#
Guess I'm not over you

          Eb
Baby it hurts so good
 
               B
More than it really should