According to my ears, the whole song consists of the three simple chords listed below.
I have no idea how to name them , so I'm just going to refer to them by the name of 
their 'parent' chords.
The strumming is easy enough to figure out, just give the song a good listen.

    A    G    F
E | --0----0----0--
B | --0----0----0--
G | --6----4----2--
D | --7----5----3--
A | --7----5----3--
E | --5----3----1--

When playing the F chord, Rick White does this little melody thing:

E | --0--0--3--3--0--0--3--3--
B | --0--0--0--0--0--0--0--0--
G | --2--2--2--2--2--2--2--2--
D | --3--3--3--3--3--3--3--3--
A | --3--3--3--3--3--3--3--3--
E | --1--1--1--1--1--1--1--1--

... Well, you'll figure it out.


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INTRO: A , G , F (with the melody)

A
You have a little secret
F
That you share with someone else, you said
A
That it was nothing but something
F
To talk about
A
It's true that we were broken up
    F
You could do anything, and you did
A
But I know a little something,
F
block it out of my head

[INTRO CHORD SEQUENCE]

It seems like it's a little secret
Between you and her, that's all you said
But if it's nothing, then how come
It's so wrong?
A wrongful act I will not forget
My love and heart are too strong to let
You out of my life for something gross
That's in the past... the past

Please tell me, please help me
Get it together, you really hurt me
Make me feel like it's all my fault
Don't go back again... don't go back again

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Hope I was of help. Good luck.