I hope these chords helps. Maybe they are not exactly like William plays it but it can be helpful.
Capo on 7th fret
Chords relative to capo
Listen to the song and get the right feeling. 

(Main chords): C G Dadd11 Em

C      032010
G      320000, 32022 or 35500
Dadd11 054030, you can play D too
Em     022000

Intro: C G Dadd11 Em C G Dadd11

Em       C                G                Dadd11     
I'm not comfortable with how we never talk

Em    C                    G                                         
And I miss you since you went out for that walk

Dadd11   Em                C             G
Its been 13 months since May

Dadd11    Em                C, G, Dmaj11
It still feels like yesterday


Em      C                G          Dadd11
I was scared to fix what I had broke

Em    C               G                     Dadd11
Its a lonely place to live with just a ghost

Em       C                G              Dadd11
There is love left in my life, I will see

Em             C      G      Dadd11
But you still hurt me


Em C G Dadd11


Em    C                     G                        Dadd11
I can still see all your clothes thrown on the floor

Em         C                 G              Dadd11
There are friends who never call me anymore

Em   C               G                    Dadd11
I remember throwing out all of your things

        Em             C     G     Dadd11
But I think I kept my ring



(Dadd11)    C             G                Dadd11
I'm not comfortable with how the story ends

Em      C                     G              Dadd11
We were lovers and now we're not even friends

Em        C              G                   Dadd11
You were perfect and I guess I'm just a creep

Em             C      G    Dadd11             Em
But you still hurt me

Outro: C G Dadd11 Em 

If you want to use a ukulele these chords sounds great with Eu-tuning (ADF#B)
Ukulele chords: G D A Bm
G replaces the C
D replaces the G
A replaces the Dadd11
Bm replaces the Em