How to read tablature? 
Riff as Intro and through the Verses - fingerpick or chords -: 
     Cadd9     G               D         Em7
xA|--3--x---|--------2------|--0--x---|--------2------|
xE|--3--x---|--3---3---3----|--2--x---|--0---0---0----|
xC|--4--x---|----2-------2--|--2--x---|----2-------2--|
xG|--0--x---|---------------|--2--x---|---------------|

Intro: Riff

Verse:
Cadd9                    G 
I remember when we broke up the first time 
D                           Em7
saying this is it I've had enough cause like 
   Cadd9                        G 
we haven't seen each other in a month 
         D               Em7
when you said you needed space what?

Verse:
Cadd9                          G
Then you come around again and say
       D                              Em7 
baby I miss you and I swear I'm gonna change
         Cadd9                          G
Trust me remember how that lasted for a day
        D                          Em7 
I say I hate you, we break up, you call me, I love you

Pre-Chorus:
Cadd9    G          D              Em7
Oooooo-o-o-o-ooh we called it off again last night 
but
Cadd9    G            D        Em7
Oooooo-o-o-o-ooh this time I'm telling you I'm telling you

Chorus:
Cadd9  G              D        Em7    D   
We are never ever ever getting back together
Cadd9  G              D        Em7    D   
We are never ever ever getting back together 
Cadd9          G                    D                  Em7-D   
You go talk to your friends talk to my friends talk to me 
    Cadd9  G          D        D----
but we are never ever ever ever getting back together

Post-Chorus:
     Cadd9     G               D         Em7
xA|--3--x---|--------2------|--0--x---|--------2------|
xE|--3--x---|--3---3---3----|--2--x---|--0---0---0----|
xC|--4--x---|----2-------2--|--2--x---|----2-------2--|
xG|--0--x---|---------------|--2--x---|---------------|
    like ever

Verse:
    Cadd9                         G
I'm really gonna miss you picking fights
       D                                 Em7
and me falling for it screaming that I'm right
        Cadd9                            G
And you hide away and find your peace of mind 
          D                      Em7
with some indie record that's much cooler than mine

Pre-Chorus:
Cadd9    G           D             Em7
Oooooo-o-o-o-ooh you called me up again tonight 
but
Cadd9    G            D        Em7
Oooooo-o-o-o-ooh this time I'm telling you I'm telling you

Chorus:
Cadd9  G              D        Em7    D   
We are never ever ever getting back together
Cadd9  G              D        Em7    D   
We are never ever ever getting back together 
Cadd9          G                    D                  Em7-D   
You go talk to your friends talk to my friends talk to me 
    Cadd9  G          D        D----
but we are never ever ever ever getting back together

Post-Chorus:
Cadd9 G D Em7-D   
Ooh, ooh, 
Cadd9 G D Em7-D   
ooh, oh

Bridge - quiet -:
Cadd9     G          D          Em7
I used to think that we were forever ever 
    Cadd9     G   D           Em7
and I used to say never say never

-talk, play the Riff or chords over it-
     Cadd9     G               D         Em7
xA|--3--x---|--------2------|--0--x---|--------2------|
xE|--3--x---|--3---3---3----|--2--x---|--0---0---0----|
xC|--4--x---|----2-------2--|--2--x---|----2-------2--|
xG|--0--x---|---------------|--2--x---|---------------|

Ugh so he calls me up and he's like 'I still love you and I'm like 'I'm just sick of it I mean 

-talk, play the Riff or chords over it-
     Cadd9     G               D - strum once -
xA|--3--x---|--------2------|--0------|
xE|--3--x---|--3---3---3----|--2------|
xC|--4--x---|----2-------2--|--2------|
xG|--0--x---|---------------|--2------|

this is exhausting you know like, we are never getting back together like ever

Outro:
Cadd9  G              D        Em7    D   
We are never ever ever getting back together 
Cadd9  G              D        Em7    D   
We are never ever ever getting back together 

Cadd9          G                    D                  Em7-D   
You go talk to your friends talk to my friends talk to me 
    Cadd9  G          D        D
but we are never ever ever ever getting back together

Cadd9  G               D                        Em7    D   
We    - ooooh-o-o-o-ooh ooooh-o-o-o-ooh - getting back together
Cadd9  G               D                        Em7    D   
We    - ooooh-o-o-o-ooh ooooh-o-o-o-ooh - getting back together

Cadd9          G                    D                  Em7-D   
You go talk to your friends talk to my friends talk to me 

but
    Cadd9  G          D        D----
but we are never ever ever ever getting back together