B                                                       G#m     E
Somebody told me that you found somebody new and you're happy
B                                             G#m     E
You were never really very good at being alone
B                                              G#m         E
Apparently, it's getting serious, so whatever that means
B                                                     G#m       E
I'm sure you told him I was just somebody you used to know, oh, oh

[Chorus]
  NC                      E
I know he doesn't know it all (Know it all)
                               F#                      E
No, he don't know that you and me had something chemical (Chemical)
                               F#                      E
The things you said to me when we were drunk in Montreal (Montreal)
                    F#        E
I bet you told him about me,
F#                             (B)
But I know he doesn't know it all (Know it all, know it all)

[Verse 2]
B                                                       G#m        E
Do you remember when the world was in the walls of your bedroom?
B                                                  G#m       E
And everything you said to me was like a line in a song
B                                                   G#m       E
I still remember what it felt like the first time I had you
B                                                           G#m       E
And now he probably thinks that all your feelings for me are gone
(E)
And maybe they're gone

[Chorus]
  NC                      E
I know he doesn't know it all (Know it all)
                               F#                      E
No, he don't know that you and me had something chemical (Chemical)
                               F#                      E
The things you said to me when we were drunk in Montreal (Montreal)
                    F#        E
I bet you told him about me,
F#                             E
But I know he doesn't know it all
                              F#                    E
Like why you love the color yellow but you hate the song (Hate the song)
                             F#                E
And how you told me I would always be the only one (Only one)
                    F#       E
I bet you told him about me
       F#                      (E)
But I know he doesn't know it all (Know it all, know it all)


[Bridge]
G#m         F#                   D#m
Honestly, I hope you're happy, hope you're doing well
G#m               F#           D#m                E
I still keep your secrets even though you're with someone else

[Chorus]
  NC                      E
I know he doesn't know it all (Know it all)
                               F#                      E
No, he don't know that you and me had something chemical (Chemical)
                               F#                      E
The things you said to me when we were drunk in Montreal (Montreal)
                    F#        E
I bet you told him about me,
F#                             E
But I know he doesn't know it all
                              F#                    E
Like why you love the color yellow but you hate the song (Hate the song)
                             F#                E
And how you told me I would always be the only one (Only one)
                    F#       E
I bet you told him about me
       F#                      (E)
But I know he doesn't know it all (Know it all, know it all)