Okay, so this is kind of like the demo from Scrapbook. I prefer to play this 
version, and it sounds really cool on acoustic.

Standard tuning.
Eadgbe

Intro goes like this.

Intro:
|--3---3---3---3-|--3---3---3---3-|--3---3---3---3-|-3--------------|
|-1-1-1-1-1-1-1-1|-1-1-1-1-1-1-1-1|-1-1-1-1-1-1-1-1|-1--------------|
|----------------|----------------|----------------|-0--------------|
|3---3-----------|----------------|3---3-----------|-0--------------|
|--------3---3---|--------0---0---|--------3---3---|-0--------------|
|----------------|3---3-----------|----------------|-3--------------|

Then just play:


F
They're all gone now.

C
Took a long time

G
You're the only one,

Am
Who'd be my valentine.

F
I didn't want that

C
To drive you crazy

G
Should have done something

Am
Guess i'm lazy

F            C
Feeling down low now

G                    Am
Someone tell me what i should do

F                       C
Because i've never been perfect

G                    Am
But i never meant to drag down you so

F                  C
If i'm dragging you down now

G                   Am
I could wait in the lost and found

F                         C
Just promise me you'll be perfect

G                       Am               F
And i promise that i'll come around sometimes

    C      G         Am
To saaaay hello all smiles


The next part continues until the end of the song
It's three chords. Play them like this.
(I like to just play the first three strings then add in the rest as I build up toward the end.)

Am               G                F
-5------------   -3------------   -1------------
-5------------   -3------------   -1------------
-5------------   -4------------   -2------------
-7------------   -5------------   -3------------
-7------------   -5------------   -3------------
-5------------   -3------------   -1------------

So, for now, just play the first three strings:

Am         G           F
Maybe it's time to let go

Am                    G               F
Probably doesn't even weigh that much now

Am
So i'll drop it

G
I'll turn around fast

F
I'll shake your hand and take


Six steps back

Am                    G
We'll have a seat and another cigarette

F
We'll have a drink for nothing to regret (Start building up and adding the rest of the chord)

Am                         G
We'll clap our hands when, when we hear that sound

F
Won't be sad now


Won't be feeling down

Am
We could live or die

G
Have a great time

F
I'll be your valentine


An ugly valentine

Am
We could live or die

G
Have a great time

F
You'll be my valentine


A perfect valentine

(Strum once for each chord)
Am                    G                F 
We could live and die be my valentine. Be my valentine


This was my second tab.
Hopefully this was cool.
If you have corrections comment them.
Thank you.