Standard Tuning.

Intro
G|--------------------------------------------|
D|--------------------------------------------|
A|-22222222222222222222-0000000---------------|
E|-----------------------------4444444-2222222|

Verse
G|-------------------------------|
D|-------------------------------|
A|-2222222-0000000---------------|
E|----------------4444444-2222222|

"Flashback to 17"
G|--------------------------------|
D|--------------------------------|
A|5\2222222-0000000---------------|
E|-----------------4444444-2222222|

Pre Chorus
G|---------------|
D|---------------|
A|---------------|
E|-66-422-466-622| x2

Chorus
G|------------------------------------------------|
D|------------------------------------------------|
A|-2222222-0000000--------------------------------|
E|----------------4444444-2222222-0000000-22222222|

G|-------------------|
D|-------------------|
A|-------------------|
E|-0000000-2222222-2~|

G|-------------------------|
D|-------------------------|
A|-5\2222222---------------|
E|----------4444444-2222222|

"She gives me butterflies"
G|----------------------------------|
D|----------------------------------|
A|-5\2222222-0000000----------------|
E|------------------44444444-2222222| x2

Pre Chorus
Chorus

Bridge
G|---------------------------------------------------|
D|---------------------------------------------------|
A|---------------------------------------------------|
E|-22-2-466-6-422-2-466-6-422-2-466-6-422-2-466-6-422|

G|-------------------------------------------------|
D|-------------------------------------------------|
A|-------------------------------------------------|
E|-2-466-6-422-2-466-6-4-2-2-2-2-2-2-2-2-2222222222|

G|--------------------------|
D|--------------------------|
A|--------------------------|
E|-2-2-2-2-2-2-2-2-222222222| x3

Chorus
G|-----------------------------------------------|
D|-----------------------------------------------|
A|-2222222-0000000-------------------------------|
E|----------------4444444-2222222-0000000-2222222| x2

Then
G|-------------------|
D|-------------------|
A|-------------------|
E|-0000000-2222222-2~|

Break

G|----------------------------|
D|----------------------------|
A|-5\2222222------------------|
E|----------4444444-2222222-0~|

Thats it, enjoy.

Cheers.