Maybe not entirely accurate, transcribed it by ear. Hope you like it!!
P.S., first tab.
E D F E
E D
I should have known by the way you passed me by
F A
There was something in your eyes and it wasn't right
E D
I should have walked but I never had the chance
F A
Everything got out of hand and I let it slide
E D F A
Now I only have myself to blame for falling for your stupid games
E D F A (abrupt stop)
I wish my life could be the way it was before I saw your face
E D
You stole my happy, you made me cry
F A F
Took the lonely and took me for a ride
D
And I wanna uh-uh-uh-uh-uh-undo it
E D
You had my heart, now I want it back
F A F
I'm starting to see everything you lack
D A
Oh, you blew it, you put me through it
E
I wanna uh-uh-uh-uh-uh-undo it
E
Na, na, na, na, na
D
Na, na, na, na, na
F A
Na, na, na, na, na, na
[ Tab from: https://www.guitartabs.cc/tabs/c/carrie_underwood/undo_it_crd_ver_2.html ]
E D
Now your photos don't have a picture frame
F A
And I never say your name and I never will
E D
And all your things, well I threw them in the trash
F A D
And I'm not even sad
E D F A
Now you only have yourself to blame for playing all those stupid games
E D F A D
You're always gonna be the same, oh no, you'll never change
E D
You stole my happy, you made me cry
F A F
Took the lonely and took me for a ride
D
And I wanna uh-uh-uh-uh-uh-undo it
E D
You had my heart, now I want it back
F A F
I'm starting to see everything you lack
D A
Oh, you blew it, you put me through it
E
I wanna uh-uh-uh-uh-uh-undo it
E
Na, na, na, na, na
D
Na, na, na, na, na
F A
Na, na, na, na, na, na
F D A
You want my future, you can't have it
F D A
I'm still trying to erase you from my past
E D
I need you gone so fast!
E D
You stole my happy, you made me cry
F A F
Took the lonely and took me for a ride
D
And I wanna uh-uh-uh-uh-uh-undo it
E D
You had my heart, now I want it back
F A F
I'm starting to see everything you lack
D A
Oh, you blew it, you put me through it
E
I wanna uh-uh-uh-uh-uh-undo it
E D
You stole my happy, you made me cry
F A F
Took the lonely and took me for a ride
D A
Oh, you blew it, you put me through it
E D A
I wanna uh-uh-uh-uh-uh-undo it