Strumming pattern is a bit difficult but just listen to the song and you should pick it up!!
CAPO ON 3RD FRET!!!!
Intro: c am f g

Verse 1:
c                       am
everything I know about love
                  f  g
I learned from you
c                           am
and everything I know about pain
                 f   g
I learned from you
               c
you were my only
               am
you were my first
               f
you showed me lonely
                g
and you took me in when I was hurt
        c                             am
but the most important thing you ever gave me
            f                g
you was the one that hurt the most
so...

Hook:
c                 am          f  g
Thank you for the broken heart
    c                 am           f  g
and thank you for the permanent scar
          c
cuz if it wasn't for you
        am
I might forget
       f
how it feels to let go
        g             c            am
how it feels to get a brand-new start
 f                   g       c
Thank you for the broken heart

Verse 2:
   c                      am     
I still remember when you called
             f 
and said that he
       g
didn't mean anything
c                       am
how could you expect me to
        f
look at you
         g
the same way
             c
you were my only
            am
but not my last
              f
you showed me lonely
                g
and you made me put you in the past
        c                             am
but the most important thing you ever gave me
        f                 g
was the one that hurt the most
so...

(Hook)

Bridge:
           am                           f
and *every time I find myself alone in pieces
        g  
(I find myself)
          am                              f
I'll just remember when you hurt me and I made it

Chorus 2:
  c                  am         f g
So thank you for the broken heart
   c                   am         f  g 
And thank you for the permanent scar
          c             
cuz if it wasn't for you
  am       
I wouldn't be here
         f 
with the love of my life
       g
all my pain disappeared
  c          am
I've come so far
    f                g         c
so thank you for the broken heart