Great and pretty easy song. Palm mute the chords when playing the verse. No other tab 
to get it quite right, at least the ones I've come accross. I think this is the right way 
play it. Anyway, enjoy it!

Tuning: Standard

Chords used : C C/B Am F G

I'll list the chords for the beginners...

C : 032010
C/B : 020010
Am : 002210
F : 133211
G : 320033 or 320003

Capo : 2nd fret

VERSE:
C       C/B
One Two Three Four
Am               F
Tell me that you love me more
C          C/B
Sleepless, long nights
Am                F
That was what my youth was for

C          C/B       Am            F
Oh teenage hopes are lying at your door
C             C/B         Am             F
Left you with nothing But they want some more

CHORUS:
G  F
Oh-Oh
       F
You're changing your heart
G  F
Oh-Oh
     F
You know who you are

VERSE: (same as previous)
Sweetheart, bitter heart
Now I can't tell you apart
Cozy and cold
Put the horse before the cart

Those teenage hopes
Who have tears in their eyes
Too scared to own up
To one little lie

Oh, oh, oh
You're changing your heart
Oh, oh, oh
You know who you are

One, two, three, four, five, six, nine, and ten
Money can't buy you back the love that you had then
One, two, three, four, five, six, nine, and ten
Money can't buy you back the love that you had then

Oh, oh, oh
You're changing your heart
Oh, oh, oh
You know who you are
Oh, oh, oh
You're changing your heart
Oh, oh, oh
You know who you are