Hi ya'll!So basically, Capo on 3rd fret chords are F, AM,G ,DM &C
Strumming Pattern:DDUUDU
enjoy!!!!
So the sequence is
1)Verse
2)Pre Chorus
3)Chorus
4)Bridge
(Verse)
C
Once upon a time, a few mistakes ago
AM
I was in your sights, you got me alone
F
You found me, you found me
G
You found me-e-e-e-e
C
I guess you didn't care and I guess I liked that
AM
And when I fell hard, you took a step back
F
Without me, without me
G
Without me-e-e-e

(Pre-chorus)

         AM
And he's long gone
F            AM  
When he's next to me
 F               AM(*STRUM ONCE!)  
And I realize, the blame is on me

Chorus:)Strum once
AM                        F                    C          

'Cause I knew you were trouble when you walked in
     AM F       C    G          AM              F  

So shame on me now, flew me to places I'd never been
G
Till you put me down (STRUMMING..):)
AM                 F                       C

Oh I knew you were trouble when you walked in

   AM F       C    G          AM              F  

So shame on me now, flew me to places I'd never been
G                    AM         F
Now I'm lying on the cold hard ground
AM      F         C
Oh, oh, trouble, trouble, trouble
AM      F         C
Oh, oh, trouble, trouble, trouble



(Verse 2)
No apologies, he'll never see you cry
Pretends he doesn't know that he's the reason why
You're drowning, you're drowning
You're drowning-ing-ing-ing-ing
And I heard you moved on from whispers on the street
A new notch in your belt is all I'll ever be
And now I see, I now I see
I now I see-e-e-e-e

(Pre-Chorus)
He was long gone
When he met me
And I realize the joke is on me
Hey!

(Chorus)
I knew you were trouble when you walked in
So shame on me now, flew me to places I'd never been
Till you put me down
Oh I knew you were trouble when you walked in
So shame on me now, flew me to places I'd never been
Now I'm lying on the cold hard ground

Oh, Oh, trouble, trouble, trouble
Oh, Oh, trouble, trouble, trouble



(Bridge)
DM(Strum from the D string)
When the saddest fear
AM
Comes creeping in
F                            DM     AM        C
That you never loved me... or her or anyone or anything
AM      
Yeah!
(Chorus)
I knew you were trouble when you walked in
So shame on me now, flew me to places I'd never been
Till you put me down
Oh I knew you were trouble when you walked in
So shame on me now, flew me to places I'd never been
Now I'm lying on the cold hard ground

Oh, Oh, trouble, trouble, trouble
Oh, Oh, trouble, trouble, trouble

I knew you were trouble when you walked in
Trouble, trouble, trouble
I knew you were trouble when you walked in
Trouble, trouble, trouble!



So tell me in the comments below how you think and if it helps you, give me 5 stars for this tab 
and it will help me too!Or if u want more in the comments..