I should have known by the way you passed me by
There was something in your eyes and it wasn't right
I should have walked but I never had the chance
Everything got out of hand and I let it slide
Now I only have myself to blame
For falling for your stupid games
I wish my life could be the way
It was before I saw your face
You stole my happy, you made me cry
Took the lonely and took me for a ride
And I wanna uh-uh-uh-uh-uh-undo it
You had my heart, now I want it back
I'm starting to see everything you lack
Boy, you blew it, you put me through it
I wanna uh-uh-uh-uh-uh-undo it
Na, na, na, na, na
Na, na, na, na, na
Na, na, na, na, na, na
Now your photos don't have a picture frame
And I never say your name and I never will
And all your things, well I threw them in the trash
And I'm not even sad
Now you only have yourself to blame
For playing all those stupid games
You're always gonna be the same
Oh no, you'll never change
You stole my happy, you made me cry
Took the lonely and took me for a ride
And I wanna uh-uh-uh-uh-uh-undo it
You had my heart, now I want it back
I'm starting to see everything you lack
Boy, you blew it, you put me through it
I wanna uh-uh-uh-uh-uh-undo it
Na, na, na, na, na
Na, na, na, na, na
Na, na, na, na, na, na
You want my future, you can't have it
I'm still trying to erase you from my past
I need you gone so fast
You stole my happy, you made me cry
Took the lonely and took me for a ride
And I wanna uh-uh-uh-uh-uh-undo it
You had my heart, now I want it back
I'm starting to see everything you lack
Boy, you blew it, you put me through it
I wanna uh-uh-uh-uh-uh-undo it
You stole my happy, you made me cry
Took the lonely and took me for a ride
Boy, you blew it, you put me through it
I wanna uh-uh-uh-uh-uh-undo it
Send "Undo It" Ringtone to your Cell 
Correct these lyrics
Thanks to alexandra_feaa for these lyricsThere was something in your eyes and it wasn't right
I should have walked but I never had the chance
Everything got out of hand and I let it slide
Now I only have myself to blame
For falling for your stupid games
I wish my life could be the way
It was before I saw your face
You stole my happy, you made me cry
Took the lonely and took me for a ride
And I wanna uh-uh-uh-uh-uh-undo it
You had my heart, now I want it back
I'm starting to see everything you lack
Boy, you blew it, you put me through it
I wanna uh-uh-uh-uh-uh-undo it
Na, na, na, na, na
Na, na, na, na, na
Na, na, na, na, na, na
Now your photos don't have a picture frame
And I never say your name and I never will
And all your things, well I threw them in the trash
And I'm not even sad
Now you only have yourself to blame
For playing all those stupid games
You're always gonna be the same
Oh no, you'll never change
You stole my happy, you made me cry
Took the lonely and took me for a ride
And I wanna uh-uh-uh-uh-uh-undo it
You had my heart, now I want it back
I'm starting to see everything you lack
Boy, you blew it, you put me through it
I wanna uh-uh-uh-uh-uh-undo it
Na, na, na, na, na
Na, na, na, na, na
Na, na, na, na, na, na
You want my future, you can't have it
I'm still trying to erase you from my past
I need you gone so fast
You stole my happy, you made me cry
Took the lonely and took me for a ride
And I wanna uh-uh-uh-uh-uh-undo it
You had my heart, now I want it back
I'm starting to see everything you lack
Boy, you blew it, you put me through it
I wanna uh-uh-uh-uh-uh-undo it
You stole my happy, you made me cry
Took the lonely and took me for a ride
Boy, you blew it, you put me through it
I wanna uh-uh-uh-uh-uh-undo it
Send "Undo It" Ringtone to your Cell Correct these lyrics
