Powerchords:
   Ab5      F5     C#5   
e | ------------------------ | 
B | ------------------------ | 
G | ----------10------------ | 
D | --6-------10-----11----- | 
A | --6-------8------11----- | 
E | --4--------------(b9)----- | 


verse:

          Ab5
You can't fight

            F5
To make it better

           C#5
You can't cry

                         Ab5
And hope that this won't end

          Ab5
Some say love

         F5
It is forever

           C#5
But all I know

                    Ab5
Is that we're just friends

Chorus:
So,
     Fm(*)
I'll give it all back, I'll give it all back

   C#5
To you

      Fm(*)                 F(*)
I'll give it all back, I'll give it all back

    C#5
To you.

Ab5
Yeah?

verse:
Now you know me
Like no other
And you know when
I'm telling lies
So you believe
If you wanna
But you know I
I wanna say goodbye

[Chorus]

           Ab5
You can't fight

            F5
To make it better

          C#5
You can't cry

                         Ab5
And hope that this won't end

          Ab5
Some say love

         F5
It is forever

          C#5
But all I know

                    Ab5
Is that we're just friends

[Chorus]

Yeah?.

(so, I'll give it all back, I'll give it all back?) 



More convenient version: capo 4th fret, chords: E, C#m , A.

Have fun