I mostly oriented myself from the acoustic version that can be found on Spotify on their album
"All or Nothing (International Bundle 1)", Billy plays it slightly different on https://youtu.be/UEOPpgDPX_w
where he plays some Gadd6s as normal G chords, those instances will be written as 'G6'.
He also plays the intro only twice in the video.
Chords used:
Dm xx0231
Fmaj7 x33210
G 320033
Gadd6 x55430
Am x02210
[Intro]
Am G Fmaj7 Dm x4
[Verse 1]
Am G Fmaj7 Dm
Get out of my town, get out of the spotlight
Am G Fmaj7 Dm
You saw my heart so what does it look like?
Am G Fmaj7 Dm
It's not what you do but how it gets done
Am G Fmaj7 Dm
And now I've had my fun
[Pre-Chorus 1]
Fmaj7 Gadd6
I took you out into the world
Am Dm
I tore you down and I burnt you badly
Fmaj7 Gadd6
I scream and shout, I'm lost for words
Am
I don't know
Fmaj7 Gadd6
I took my gun, shot you down
Am Dm
Left an exit wound that you're afraid to show me
Fmaj7 Dm
I scream and shout but I'm lost for words
G6
I don't know
[Chorus]
Am
I won't let you down
Fmaj7
I won't let you down
Dm G6
I won't tear your heart out
[Interlude]
Am G Fmaj7 Dm x2
[Verse 2]
Am G Fmaj7 Dm
I got your message and I feel like a mistake
Am G Fmaj7 Dm
You said you want to learn to let go of dead weight
Am G Fmaj7 Dm
It's not what you do but how it gets done
Am G Fmaj7 Dm
And now I've had my fun
[Pre-Chorus 2]
Fmaj7 Gadd6
I brought you back right down to earth
Am Dm
I twist your skin and I bruised you badly
Fmaj7 Gadd6
I scream and shout but I'm lost for words
Am
I don't know
Fmaj7 Gadd6
I took your heart for what it's worth
Am Dm
You say there's nothing else for you to do but hate me
Fmaj7 Dm
I scream and shout but I'm lost for words
G6
I don't know
[Chorus]
Am
I won't let you down
Fmaj7
I won't let you down
Dm G6
I won't tear your heart out
Am
I won't let you down
Fmaj7
I won't let you down
Dm G6
I won't tear your heart out
[Bridge]
Am
I won't let you down
Dm Fmaj7 Gadd6
I won't tear your heart out
Am
I won't let you down
Dm Fmaj7 G6
I won't tear your heart out
[Chorus]
Am
I won't let you down
Fmaj7
I won't let you down
Dm G6
I won't tear your heart out
Am
I won't let you down
Fmaj7
I won't let you down
Dm G6
I won't tear your heart out
[Outro]
Am G Fmaj7 Dm x3
Fmaj7 Gadd6 Am
I won't let you down