This is tabbed with the guitar at Standard Tuning, and the Capo on the 1st Fret. 
If you watch he video online, the guitars are tuned a half-step down, with capo on the 2nd fret.

Capo 1

Am    Am    F    G  %
Am    Am    F    G


VERSE
Am
Another sleepless night I can't explain 

F
Somebody said they heard me call your name. 

G                                 F
The radio won't let you leave my mind 

G                                 F
I know it's over , but I don't know why. 

CHORUS
C                                  G                                  F
Should've known better than to fall in love with you 

      Dm
Now love is just a faded memory. 

C                                  G                                  F
Should've known better, now I'm a prisoner to this pain 

      Dm                                               C F G
And my heart still aches for you. 

VERSE
Am
There was no risk that I wouldn't take 

F
Not a promise that I didn't make. 

G                                 F
All I asked was that you just hold on 

G                                 F
And now I'm wondering what I did wrong. 

CHORUS
C                                  G                                  F
Should've known better than to fall in love with you 

      Dm
Now love is just a faded memory. 

C                                  G                                  F
Should've known better, now I'm a prisoner to this pain 

      Dm                                      C F G
And my heart still aches for you. 

BRIDGE
F
I gave you all of my body and soul 

F
Never believing we might lose control 

F
I took my hands off the wheel. 


VERSE
Am
I can't remember if the lies were true 

F
It's been a million years since I touched you. 

G                                            F
I thought time might help me win this game 

G                                            F
But being away from you is slowly driving me insane. 

REPEAT CHORUS TO OUT