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 (x32010@1) Cmaj7 (x32000@1)C (x32010@1)
It's all gonna be okay, yeah
Cmaj7
And I know, 
AmMaybe (x02210@1)I'll even
                      CLaugh (x32010@1)about it someday
        Cmaj9 (x3243x@1)  G6But (320000@1)not today, no
Cmaj9 (x3243x@1)      G6Cause (320000@1)I don't feel so good
C (x32010@1)            Cmaj7I'm (x32000@1)tangled up inside
C (x32010@1)         Cmaj7My (x32000@1)heart is on my sleeve
Am (x02210@1)                       DTomorrow (xx0232@1)is a mystery to me

Chorus:
              G (320003@1)  Dadd9And (x43141@2)it might be wonderful
            Am (x02210@1) CIt (x32010@1)might be magical
            G (320003@1)     Dadd9 (x43141@2)       
It might be everything I've waited for, 
 Am (x02210@1) C (x32010@1)
A miracle
        G (320003@1)     Dadd9 (x43141@2)         G6Oh, (320000@1)but even if I fall in love again
            Cadd9With (x32030@1)someone new
          Dadd9 (x43141@2)     Cadd9 (x32030@1)     D (xx0232@1)  
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