Very easy song.  Basically same chords throughout w/ minor variations.  You can play E5 A5 B5 and F#5 if it's easier for you.

Intro: E B A B x2 (listen to get the beat)

E              B             A      B
I never minded calling You a King
E                          A
If that meant that I could count on You
    A  (pause)          
To give me everything
   E                A
I never thought to ask You
   F#m            B
I always thought You knew
       E             B         A       B
It was never my intention to question You

You never minded calling me a child
Well, I guess that's how I acted all the while
But You live through every tantrum, You see through every lie
Though they seem to be more common
I just wanted You to know why oh why

E   B      A      B          E    B    A     B
Ahhhhhhh, Unforgetful You, Ahhhhhhh, unforgetful
E    B     A      B          E    B     A       B
Ahhhhhhh, Unforgetful You, Ahhhhhhh, so unforgetful

You never minded giving us the stars
Then showing us how blind and unaware of You we are
You painted me a picture and showed me how to see
Though I just won't behold it
Unless it pertains to me...

(Chorus)

E|--3-----------------------------3----------------------------------
A|----------5-4-3-------------------------5-4-3----------------------
D|-----5--3--------5--3-3b-3-0-------5--3--------5-------------------
G|-----5--3--------5--3-3b-3-0-------5--3--------5-------------------
B|--------------------------------------------------7-7b-7-7b--------
e|-------------------------------------------------------------------

E|--3-----------------------------3----------------------------------
A|----------5-4-3-------------------------5-4-3----------------------
D|-----5--3--------5--3-3b-3-0-------5--3--------5-------------------
G|-----5--3--------5--3-3b-3-0-------5--3--------5-------------------
B|---------------------------------------------------5b~~~~~5--------
e|---------------------------------------------------6-~~~~~6--------

Then it ends w/ an improvision of the chorus that has the same EBAB progression.  Not too hard.