You can transpose to -3 and use a Capo on Fret 3 and play in the key of D major.
This is a shout out to my Cex
Heard he in love with some other bchick
Yeah yeah, that hurt me, I'll aFisdmit
Forget that boy, I'm over Cit
I hope she gettin’ better sCex
Hope she ain't fakin’ it like I bdid, babe
Took four long years to call it qFisuits
Forget that boy, I'm over Cit

[Pre-chorus]
Guess I should say tChank you
For the "hate yous" and the tattoos
Oh baby, I'm bcool by the way
Ain't sure I loved Fisyou anyway
Go 'head, babe, I'mma live my blife, my Flife, yeah
CShout out to my ex, you're really quite the Fman
FisYou made my heart break and that made me who I am
CHere's to my ex, hey, look at me Fnow
Well, I, FisI'm all the way up
I swear you'll never bring me down
CShout out to my ex, you're really quite the Fman
FisYou made my heart break and that made me who I am
bHere's to my ex, Fhey, look at me now
Well, I, FisI'm all the way up
I swear you'll never, you'll Fnever bring me down C 
Oh, I deleted all your Cpics
Then blocked your number from my bphone
Yeah yeah, you took all you could Fisget
But you ain't getting this love no Cmore
‘Cause now I'm living so Clegit
Even though you broke my heart in btwo, baby
But I snapped right back, I'm so brand Fisnew, baby
Boy, read my lips, I'm over Cyou, over you


[Pre-chorus]
Guess I should say tChank you
For the "hate yous" and the tattoos
Oh baby, I'm bcool by the way
Ain't sure I loved Fisyou anyway
Go 'head, babe, I'mma live my blife, my Flife, yeah
CShout out to my ex, you're really quite the Fman
FisYou made my heart break and that made me who I am
CHere's to my ex, hey, look at me Fnow
Well, I, FisI'm all the way up
I swear you'll never bring me down
CShout out to my ex, you're really quite the Fman
FisYou made my heart break and that made me who I am
bHere's to my ex, Fhey, look at me now
Well, I, FisI'm all the way up
I swear you'll never, you'll Fnever bring me down C 

[Post-Chorus]
COoh, ooh, ooh, ooh, ooh, ooh
Ooh, ooh, Fooh, ooh, ooh, Fisooh, oooh, ooh
You'll never bring me dbown
Ooh, ooh, ooh, ooh, ooh, ooh
FOoh, ooh, ooh, ooh, ooh, Fisooh, oooh, ooh (Yeah)
CShout out to my ex, you're really quite the Fman
FisYou made my heart break and that made me who I am
bHere's to my ex, Fhey, look at me now
Well, I, FisI'm all the way up
I swear you'll never, you'll Fnever bring me dooooown
CShout out to my ex, you're really quite the Fman (You're quite the man)
FisYou made my heart break and that made me who I am
CHere's to my ex, hey, look at me Fnow
Well, I, FisI'm all the way up
I swear you'll never bring me down (You'll never bring me down)
CShout out to my ex, you're really quite the Fman
FisYou made my heart break and that made me who I am
bHere's to my ex, Fhey, look at me now (Won't you just look at me now)
Well, I, FisI'm all the way up
I swear you'll never, you'll Fnever bring me down C 

[Outro] - C , F Gb , Bm , F Fis

Oh, oh, oh, oh, oh, oh, oh
Oh, oh, oh, oh, oh
Oh, oh, oh, oh, oh, oh, oh
Oh, oh, oh, oh, oh
Oh, oh, oh, oh, oh, oh, oh
Oh, oh, oh, oh, oh
Oh-oh-oh, oh-oh-oh, oh-oh-oh, oh, oh, oh
Never bring me dCown...