Intro/Outro/Verse: F#m  F#m  D  C#m . I couldn't tab the exact base line, but I 
tried to make similar one, here it is:

E|2-2--------------------|2-2---------------5-7-|
A|-----4---4-5-5--5-4-4--|-----4---4-5-7-5-4----|
D|------4----------------|------4---------------|
B|-----------------------|----------------------|
G|-----------------------|----------------------|
e|-----------------------|----------------------|

Verse:

F#m (244222@1) F#m (244222@1)  D (xx0232@1)  C#Summer (x43121@1)came to an end,
   F#m (244222@1) F#m (244222@1)  D (xx0232@1)  C#We're (x43121@1)saying good bye to friends,
   F#m (244222@1) F#m (244222@1)  D (xx0232@1)  C#We (x43121@1)met this month,
We'll keep in touch,
   F#m (244222@1) F#m (244222@1)  D (xx0232@1)  C#I (x43121@1)wish time would stop instead.

F#m (244222@1) F#m (244222@1)  D (xx0232@1)  C#'Cause (x43121@1)I don't wanna say good bye,
   F#m (244222@1) F#m (244222@1)  D (xx0232@1)  C#When (x43121@1)I'm caught up in your eyes.
   F#m (244222@1) F#m (244222@1)  D (xx0232@1)  C#I (x43121@1)wanna stay like this,
Like our first kiss,
   F#m (244222@1) F#m (244222@1)  D (xx0232@1)  C# (x43121@1)         
That brought my heart to life.
   
   F#m E before the chorus

Chorus:
 A (x02220@1)   D (xx0232@1) ADon't (x02220@1)let go,
 E (022100@1)             A (x02220@1)   D (xx0232@1) ATell (x02220@1)her so she won't let go.
 EShe (022100@1)may never know.
 ASo (x02220@1)tell her,
 DI (xx0232@1)should tell her,
 A (x02220@1)               EBefore (022100@1)my heart explodes.
 A (x02220@1)   D (xx0232@1) ADon't (x02220@1)let go,
 E (022100@1)               
I won't let you go.

F#m  F#m  D  C#m x2

F#m (244222@1)F#m (244222@1)  D (xx0232@1)  C#mThe (x13321@4)nights are getting cold,
 F#m (244222@1)F#m (244222@1)  D (xx0232@1)  C#mAnd (x13321@4)the days are hard to hold.
 F#m (244222@1)F#m (244222@1)  D (xx0232@1)  C#mYou're (x13321@4)months away and miles from me,
 F#m (244222@1)F#m (244222@1)  D (xx0232@1)  C#mBut (x13321@4)the memory's still gold.
 F#m (244222@1)F#m (244222@1)  D (xx0232@1)  C#mI (x13321@4)think about them all the time,
 F#m (244222@1)F#m (244222@1)  D (xx0232@1)  C#mThat (x13321@4)summer when you were mine.
 F#m (244222@1)F#m (244222@1)  D (xx0232@1)  C#mBefore (x13321@4)I caved in, my words felt thin,
 F#m (244222@1)F#m (244222@1)  D (xx0232@1)  C#m (x13321@4)   F#m (244222@1) E (022100@1) 
Don't wanna say good bye, goodbye.

A (x02220@1)   D (xx0232@1) ADon't (x02220@1)let go,
 E (022100@1)             A (x02220@1)   D (xx0232@1) ATell (x02220@1)her so she won't let go.
 EShe (022100@1)may never know.
 ASo (x02220@1)tell her,
 DI (xx0232@1)should tell her,
 A (x02220@1)               EBefore (022100@1)my heart explodes.
 A (x02220@1)   D (xx0232@1) ADon't (x02220@1)let go,
 E (022100@1)               
I won't let you go.

Bridge:

D (xx0232@1)    A (x02220@1)             EPlease (022100@1)take me back to summer,
   F#m (244222@1) E (022100@1)      DSo (xx0232@1)I can let you know,
D (xx0232@1)  A (x02220@1)                EThis (022100@1)year's been such a bummer,
   F#m (244222@1) E (022100@1)      DBecause (xx0232@1)I let you go.
D (xx0232@1)    A (x02220@1)             EPlease (022100@1)take me back to summer,
   F#m (244222@1) E (022100@1)      DSo (xx0232@1)I can let you know,
D (xx0232@1)  A (x02220@1)                EThis (022100@1)year's been such a bummer,
   F#m (244222@1) E (022100@1)        A (x02220@1) D (xx0232@1) A (x02220@1) E (022100@1)x2
Because I let you go.

Chorus x2

Intro/Outro: F#m  F#m   D   C#m  x4

I tabbed this by listening to acoustic version on youtube. In my opinion the 
bridge and the chorus are spot on, and verse sounds a bit raw. But you are the 
judges ^^ . This is my first tab, so i hope you enjoy playing this.