Should've known by the way you pass me by   There was something in your eyes   And it wasn't right   I should've 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   You took the lonely and took me for a ride   And I wanna un un un un undo it   You had my heart now I want it back   I started to see everything you lack   Boy you blew it   You put me through it   I wanna un un un un undo it   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   You took the lonely and took me for a ride   I wanna un un un un 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 un un un un undo it   Na na na na na na na na na      You want my future you can't have it   Still trying to erase you from my past   I need you gone so fast      You stole my happy   You made me cry   You took the lonely and took me for a ride   I wanna un un un un 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 un un un un undo it      You stole my happy   you made me cry   You took the lonely and took me for a ride   Boy you blew it   You put me through it   I wanna un un un un undo it