Blaine:
Now and then I think of when we were together
Like when you said you felt so happy you could die
Told myself that you were right for me
But felt so lonely in [bad word] But that was love and it's an ache I still remember

Cooper:
You can get addicted to a certain kind of sadness
Like resignation to the end, always the end 
So, when we found that we could not make sense
Well, you said that we would still be friends
But I'll admit that I was glad that it was over

Blaine:
But you didn't have to cut me off
Make out like it never happened and that we were nothing
And I don't even need your love
But you treat me like a stranger and that feels so rough

Blaine (with Cooper):
No, you didn't have to (stoop so low)
Have your friends collect your records and then (change your number)
I guess that I don't (need that though)

Blaine:
Now you're just somebody that I used to know

Both:
Now you're just somebody that I used to know
Now you're just somebody that I used to know

Blaine:
Now and then I think of all the times you screwed me over 
But had me believing it was always something that I'd done
But I don't wanna live that way,
reading into every word you say
You said that you could let it go
And I wouldn't catch you hung up on somebody that you used to know

Both:
But you didn't have to cut me off

(Blaine) Cooper:
(Oh-Oh) Make out like it never happened and that we were nothing
(Ohhh) And I don't even need your love
(Oh-Oh) But you treat me like a stranger and that feels so rough
(Ohhh) No, you didn't have to stoop so low
(Oh-Oh) Have your friends collect your records and then change your number
(Ohhh) I guess that I don't need, that though
Now you're just somebody that I used to know

Blaine:
Somebody, (Band Members: I used to know)
Somebody

Cooper (with Band Members):
Now you're just somebody (that I used to know)

Blaine:
Somebody, (Band Members: I used to know)
Somebody

Cooper (with Band Members):
Now you're just somebody (that I used to know)

Both:
I used to know
That I used to know
I used to know
Somebody