No one on Ultimate Guitar seems to understand that it's an A7 chord and not a regular A.
The chords are the same in the verse and chorus, though it changes in the bridge. All the other
tabs say to play IV (Bb) at the end of the bridge but it is actually the V (C)
[Intro]
F A7 Dm Bb (x3)
F C F
[Verse]
F A7 Dm Bb
You and me, we made a vow
F A7 Dm Bb
For better or for worse
F A7 Dm Bb
I can't believe you let me down
F C F
But the proof's in the way it hurts
For months on end I've had my doubts
Denying every tear
I wish this would be over now
But I know that I still need you here
[Chorus]
You say I'm crazy
'Cause you don't think I know what you've done
But when you call me baby
I know I'm not the only one
[Verse]
You've been so unavailable
Now sadly I know why
Your heart is unobtainable
Even though Lord knows you kept mine
[Chorus]
You say I'm crazy
'Cause you don't think I know what you've done
But when you call me baby
I know I'm not the only one
[Bridge]
Bb F
I have loved you for many years
A7 Dm C
Maybe I am just not enough
Bb F
You've made me realize my deepest fear
Bb C
By lying and tearing us up
[Chorus] x2
You say I'm crazy
'Cause you don't think I know what you've done
But when you call me baby
I know I'm not the only one
[Outro]
I know I'm not the only one
I know I'm not the only one
And I know...
I know I'm not the only one
Source: https://tabs.ultimate-guitar.com/tab/sam_smith/im_not_the_only_one_chords_1683900