Hey guys! I'm really excited to be the first one to submit a tab for this song! 
Selena's amazing and this is really cool song. 
Sorry if I got any of the words or chords wrong... I don't know if the Em in the 
Chorus is correct or not, so tell me if you think it should be changed. 
Hey, comment, rate, and add me as a friend! (Haha, you don't have to...)

No Capo

Verse 1:
C                                 G
  You know fairytales don't come true 
                      F
Not when it comes to you 
Open up for the first time 
And you can bet that it's the last time 
C                            G
   And I'm cool with laying low 
                                F
Saturday night and I'm staying home 
I'm feeling good for the first time 
It's been a while since the last time 
Am               F                   G
  I'll wave goodbye when you say hello 

Chorus:
                  F                       G
I'm sick of the sleepless, never ending nights 
              Em                     F
I just don't care who was wrong or right 
                 F                 G
I'm sick of the rumours and the alibis 
            Em                        F
you tear me up, I'll cut you down in size 

        F                G
I'm so sick of you, so sick of you 
        Em               F
Sick of all your little lies 
        F                G
I'm so sick of you, so sick of you 
           Em                     F
So sick of all the girls by your side 
      F
What you don't know, 
         G        (pause)             C
Is how great it feels, to let you go 

C
  I quit your game, 
             G
It's so see through 
                              F
You know I'm way to good for you 
Moving on to the next time 
Track the baggage and I'll be fine 
C                      G                                          F
  When it's time to reminisce , your going to realize you missed this 
Your in my mind for the last time 
And at the most you were a past time 
Am               F                  G
  I'll wave goodbye when you say hello 

Chorus:
                  F                       G
I'm sick of the sleepless, never ending nights 
              Em                     F
I just don't care who was wrong or right 
                 F                 G
I'm sick of the rumours and the alibis 
            Em                        F
you tear me up, I'll cut you down in size 

        F                G
I'm so sick of you, so sick of you 
        Em               F
Sick of all your little lies 
        F                G
I'm so sick of you, so sick of you 
           Em                     F
So sick of all the girls by your side 
      F
What you don't know, 
         G                        Am
Is how great it feels, to let you go 

Bridge:
                   F
I'm happy you're alone 
                                   C
Take down your pictures and I'll throw, 
           G
Those memories out the door, I'm 
 C                                                    F
Sick of you, so sick of you, sick of all your little lies 

Chorus:
                  F                       G
I'm sick of the sleepless, never ending nights 
              Em                     F
I just don't care who was wrong or right 
                 F                 G
I'm sick of the rumours and the alibis 
            Em                        F
you tear me up, I'll cut you down in size 

        F                G
I'm so sick of you, so sick of you 
        Em               F
Sick of all your little lies 
        F                G
I'm so sick of you, so sick of you
        Em                 F
So I'm getting on with my life 

       F               G
S-s-s sick of you, so sick of you, 
    Em
So sick of you 
     F
Woah-oh (x2) 

      F
What you don't know, 
         G        (stop)             
Is how great it feels, to let you go

Hope this helped! 
Comment, rate, or add me as a friend if you want! :)
Have a good day!