You think you're such a cool kid And everybody likes you Know you think I'm stupid Say you know more than I do But what you'll never understand Is I used to be such a fan But now you're such a cool kid It's like I don't even know you, yeah I'm getting really sick Sick of how sorry sounds Coming right out your mouth, oh Don't get too comfortable 'Cause I might not be there Next time you turn around So What would you do if I leave and don't come back? I hope it breaks you in two If I gave back all the pain that you put me through What would you do? I've always been a nice girl And pretty understanding But you mess up my head boy And you're taking me for granted And you're probably gonna throw a fit When I call you out on all your shit Yeah, I used to be a nice girl I bet you wish it lasted Oh I'm getting really sick Sick of how sorry sounds Coming right out your mouth, oh Don't get too comfortable 'Cause I might not be there Next time you turn around So What would you do if I leave and don't come back? I hope it breaks you in two If I gave back all the pain that you put me through What would you do? We'll make plans and I won't show up I won't listen, I'll interrupt When your birthday comes won't answer ya 'Cause, so what, so what I'll go out and kiss your friends Like, oh my god, get over it Yeah, go get drunk so you forget I'm gone What would you do if I leave and don't come back? I hope it breaks you in two If I gave back all the pain that you put me through What would you do? Oooh-oooh-oooh, what would you do? Oooh-oooh-oooh, what would you do?