Pretty easy song,just listen to the rhythm 

Tuning:Standard (EADG)

  Verse
G|-------------------------------------------------------------------------|
D|----------------------------------------------0~-------------------------|
A|---2~--------------------0~----------------------------------------------|
E|-------------------------------------------------------------------------|

G|-------------------------------------------------------------------------|
D|-------------------------0~----------------------------------------------|
A|----------------------------------------------0~-------------------------|
E|---3~--------------------------------------------------------------------|

G|-------------------------------------------------------------------------|
D|----------------------------------------------0~-------------------------|
A|---2~--------------------0~----------------------------------------------|
E|-------------------------------------------------------------------------|

G|-------------------------------------------------------------------------|
D|-------------------------0~----------------------------------------------|
A|----------------------------------------------0~-------------------------|
E|---3~--------------------------------------------------------------------|

  Pre-Chorus
G|-------------------------------------------------------------------------|
D|---0~--------------------------------------------------------------------|
A|-------------------------0~----------------------------------------------|
E|-------------------------------------------------------------------------|

G|-------------------------------------------------------------------------|
D|-------------------------------------------------------------------------|
A|---2~-----------------------------------------0~-------------------------|
E|-------------------------3~----------------------------------------------|
  
  Chorus
G|-------------------------------------------------------------------------|
D|---0~--------------------------------------------------------------------|
A|--------------0~---------------2~----------------------------------------|
E|----------------------------------------------3~-------------------------|

G|-------------------------------------------------------------------------|
D|---0~--------------------------------------------------------------------|
A|--------------0~---------------2~----------------------------0~----------|
E|----------------------------------------------3~-------------------------|

  Verse
  Pre-chorus
  Chorus

  Bridge
G|-------------------------------------------------------------------------|
D|---0~--------------------------------------------------------------------|
A|--------------0~---------------2~-------------0~--------------(2x)-------|
E|-------------------------------------------------------------------------|

  Chorus (Bass comes in on 'Forgetting')
G|-------------------------------------------------------------------------|
D|---0~--------------------------------------------------------------------|
A|--------------0~--------------2~-----------------------------------------|
E|----------------------------------------------3~-------------------------|

  Chorus

 ~=vibrato(or ring out)
That's it.Pretty easy,just need to know to rhythm of the song.