I think this is right. 
 
Capo on the 3rd 
 
Intro    D  G  A  D 
 
 
Verse 
  D               D/C#        D/B        A 
Katy brought my guitar back today 
 G                     D                  A       D   A 
That's how she let me know that it's all over 
 D          D/C# 
I remember all those nights 
 D/B               A 
Sittin' in the fireplace light 
 G        D               Bm 
How she loved to hear me play 
 G                A           D 
Katy brought my guitar back today 
 
 D               D/C#         D/B         A 
Katy brought my guitar back today 
 G                     D            A        D  A            
I've seen it make her cry over and over 
 D                  D/C# 
She told me when I wasn't there 
 D/B                  A 
She would wake up feelin scared 
       G              D           Bm     
She'd hold it in her arms and be okay 
 G                A           D 
Katy brought my guitar back today 
 

[Refrão]
 G                             D 
We had our stormy times like anybody else 
            A                                D 
(More than once) More than once I broke her heart 
 G                               D                 
When I couldn't tell her I was sorry by myself 
 G                               A 
I could tell her with that old guitar 
    Bm                     G                   A 
But I'm afraid this time things have gone too far 
 
 
Verse 
 D               D/C#        D/B        A 
Katy broguht my guitar back today 
 G                       D                A      D    A 
I guess that means this time it's really over 
 D            D/C# 
As I sit and play it now 
     D/B               A 
The songs all seem so sad somehow 
 G                  D                Bm 
I wish she'd just thrown that thing away 
 G                A            D 
Katy brought my guitar back today 
 
 
Bridge 
 D          D/C 
I remember all those nights 
 D/B            A 
Sittin in the fireplace light 
 G                D              Em      D 
How she used to love to hear me play 
 G                     A          D 
But Katy brought my guitar back today 
 
 
Outro   D G A D