Standard tuning
Capo 1

x  mute
x2 play twice

Intro/verse 1:

strumming pattern: down down up up down up (this is only a suggestion,
there are many ways you can strum this song so just do whichever feels right)

   E5                 C#5                 A5
e | -0--0-0--0-0-0------4--4-4--4-4-4------0--0-0--0-0-0------ | 
B | -0--0-0--0-0-0------4--4-4--4-4-4------2--2-2--2-2-2------ | 
G | -1--1-2--1-1-1------x--x-x--x-x-x------2--2-1--2-2-2------ |  
D | -2--2-2--2-2-2--x2--6--6-7--6-6-6--x2--2--2-2--2-2-2------ |  x2 for intro
A | -2--2-2--2-2-2------4--4-4--4-4-4------0--0-0--0-0-0------ | 
E | -0--0-0--0-0-0------x--x-x--x-x-x------x--x-x--x-x-x------ | 

        E5
It's the little things
   C#5           A5                  E5
They pulled me in now I'm defenseless
 E5                    C#5            A5                 E5
I try to ignore like I've done before but it's just useless


Pre-chorus:

          B5                   A5               E5
I've made up my mind that I'm gonna let you in
         B5                A5 
And I'm not afraid but I have to say


Chorus:

               E5               B5
This is gonna hurt if it ever ends
                     A5                E5
But somehow you have shattered my defense
               E5                B5
This is gonna hurt if it ever starts
                     A5               E5       C#5 A5 E5 
So promise you'll be careful with my heart


Verse 2: same chords as verse 1

It's the things you do
They made me fall hard for you and I can't help it
And it's every day that I feel this way
So just don't stop it

Bridge 2: same chords as bridge 1

I've made up my mind that I'm gonna let you in 
And I'm not afraid but I have to say

Chorus 2: slight difference at the end

This is gonna hurt if it ever ends
But somehow you have shattered my defense
This is gonna hurt if it ever starts
                     A5               E5       C#5
So promise you'll be careful with my heart


Bridge:

                   F#5
I won't make excuses
                    A5
They just all seem useless
                   E5
You don't have the time
C#5                 F#5
I guess I'll take my chances
                F#5             A5
now that I know love is on the line

Chorus 3: same as chorus 2

This is gonna hurt if it ever ends
But somehow you have shattered my defense
This is gonna hurt if it ever starts
                     A5                E5         C#5
So promise you'll be careful with my heart


Outro:

A5                E5     C#5
Careful with my heart
A5                E5
Careful with my heart