This is DEFINETLY not how they play it, but I think it's close!  

G , Cadd9  

Na na na na na na na 
 Na na na na na na  
Na na na na na na na 
 Na na na na na na  

(hammer on) Em , Cadd9 

Hey girl watcha say 
 Why you pushin' me away 
 Wishin' we were closer 
 But we're not 
 Do you want me to go away now 
 Or to stay 
 You can't have it both ways 
 You're like a rollercoaster 
 'Cause you're up 
 Then you're down 

           D 
Can't you see? 
  Em 
I'm all in and 
Cadd9               D 
It's just not like me 
  
To want you, want you 
  
G , Cadd9 , G , D  

Want you to love me 
 Like it's our last day, baby 
 Love me like it's our last day, girl 
 Want you to love me like it's our last day, baby 
 Love me like it's the end 
 Love me like it's the end of the world 

(And then the whole thing repeats again) 
  
Na na na na na na na 
 Na na na na na na  
Na na na na na na na 
 Na na na na na na 
  
Hey, girl 
 What's it take 
 To get your heart 
 Before mine breaks 
 I've been giving my all 
 Don't leave me on 
 To let me fall 
  
Can't you see? 
 I'm all in 
 It's just not like me 
  
To want you, want you 
 Want you to love me 
 Like it's our last day, baby 
 Love me like it's our last day, girl 
 Want you to love me like it's our last day, baby 
 Love me like it's the end 
 Love me like it's the end of the world 

(still figuring out the bridge, will post soon)  
Like it's the end of the world 
 End of the world 
  
We can't afford to fake it 
 This is our time to make it 
 Like it's our last few seconds 
 Why can't you give us a chance? 
  
Want you to love me 
 Like it's our last day, baby 
 Love me like it's our last day, girl 
 Want you to love me like it's our last day, baby 
 Love me like it's the end 
 Love me like it's the end 
  
Want you to love me 
 Like it's our last day, baby 
 Love me like it's our last day, girl 
 Want you to love me like it's our last day, baby 
 Love me like it's the end 
 Love me like it's the end 
 Love me like it's the end of the world 
  
Na na na na na na na 
 Na na na na na na  
Na na na na na na na 
 Na na na na na na