Not sure on the Chorus riff but pretty confident the chords are correct.

So Long
Fischer Z

Intro: C G F F C G F F

C (x32010@1)                       G (320003@1)                        FWhen (133211@1)I read your letter I coudn't believe that you'd gone.
C (x32010@1)                       G (320003@1)                 FI (133211@1)dialled your number but no one answered the phone
G (320003@1)                                FI (133211@1)asked your friends to tell me if they knew where you were,
G (320003@1)                                  FThey (133211@1)said they thought that you were ill.

Break: C G F F C G F F

C (x32010@1)                    G (320003@1)                       FI (133211@1)hired a detective to try and find out where you are.
C (x32010@1)                      G (320003@1)                        FHe (133211@1)managed to trace you, he said you were living in France.
G (320003@1)                           FA (133211@1)watchman saw you climb into someone elses car
G (320003@1)                           FAnd (133211@1)drive off laughing in the night.

Chorus
F (133211@1)                 CWhy (x32010@1)didn't you tell me. 
F (133211@1)               CNot (x32010@1)leave me this way.
F (133211@1)                 CYou (x32010@1)could have told me 
F (133211@1)               CNot (x32010@1)waited for so long.

I've tried to forget you but I find myself walking the street.
I went to the doctor and he gave me something to sleep.
I sent you telegrams but you haven't aswered one.
Your mother told me I best leave you well alone.
I hope your satisfied now you've done this thing to me.
I hope you're pleased with what you've done.

Chorus
Why didn't you tell me. 
Not leave me this way.
You could have told me 
Not waited for so long.

       G (320003@1)                        FFor (133211@1)so long I never realised just exactly who you are.
       G (320003@1)                       FFor (133211@1)so long I never realised the girl I had before.
       G (320003@1)                                    FFor (133211@1)so long I hope you're satisfied you won't hear from me again.
       G (320003@1)                                         FFor (133211@1)so long I hope you're pleased with what you've done.

Chorus
Why didn't you tell me. 
Not leave me this way.
You should have told me 
Not waited for so long.

F G C  to finish

Riff played during the Chorus
E-|-----------------------------------|
B-|-----------------------------------|
G-|-----------------------------------|
D-|------------2----------------------|
A-|----3---3-5---5-3-2-0--------------|
E-|----------------------3-5----------|