It may look complicated, but it's really easy chords changes.
Standard tuning
no capo


CHORDS:
Cmaj9  G6  C  Cmaj7 Am  D  G Dadd9 Cadd9
  -    -   -   -    -   2  3   -     -   
  1    -   1   -    1   3  3   3     3  
  -    -   -   -    2   2  -   2     -   
  -    -   2   2    2   -  -   -     2   
  2    2   3   3    -   -  2   -     3   
  3    3   -   -    -   -  3   2     -   

          Cmaj9  G6 Cmaj9 G6
Everything's cool, yeah
                 C   Cmaj7  C  
It's all gonna be okay, yeah
Cmaj7
And I know, 
Am
Maybe I'll even
                      C
Laugh about it someday
        Cmaj9    G6
But not today, no
Cmaj9        G6
Cause I don't feel so good
C              Cmaj7
I'm tangled up inside
C           Cmaj7
My heart is on my sleeve
Am                         D
Tomorrow is a mystery to me

Chorus:
              G    Dadd9
And it might be wonderful
            Am   C
It might be magical
            G       Dadd9         
It might be everything I've waited for, 
 Am   C  
A miracle
        G       Dadd9           G6
Oh, but even if I fall in love again
            Cadd9
With someone new
          Dadd9       Cadd9       D    
It could never be the way I loved you

(then continue same pattern)
Cmaj9   G6   Cmaj9   G6


look at this video for help on strumming...

Its on youtube, search "Selena Gomez - The Way I Loved You, by GuitarTutee.com"
http://www.youtube.com/watch?v=1GJ12w-I6S4