I am not going to place the chords in the lyrics because the rhythm never changes. 
The first 3 chords come down, then the next 3 are the same just walking back up. 
(Note the bass notes change for effect). Listen to the song if you cant remember how it goes.

-Cloud9

down         Ebm/B , C#/Bb,  B/Ab  
then up      B (x2444x@1)   , C#,     Ebm (xx4342@1)My whole life has changed(My whole life has changed)
 Since you came in(since you came in)
 I knew back then(I knew back then)
 You were that special one
 You were that one)
 I'm so in love (so in love)
 So deep in love (so deep in love)
 You make my life complete(you complete me)
 You are so sweet (are so sweet)
 No one competes (no one competes)
 Glad you came into my life (my life)
 You blind me with your love (love)
 with you I have no sight (no sight)
 
Girl you open me I'm wide open
 And I'm doing things I never do
 But I feel so good, I feel so good
 Why it take so long for me finding you?
 
This is my story and I'm telling you
 It's not fiction, it's surely a fact
 Without you right here having my back
 I really don't know just where I'd be at
 
My whole life has changed (My whole life has changed yeah)
 Since you came in, I knew back then (Ooh...oh...Yeah)
 You were that special one (You were that)
 I'm so in love, so deep in love
 
You make my life complete (You make make my life complete)
 You are so sweet no one competes(oh oh oh)
 Glad you came into my life (Ooo...)
 You blind me with your love, with you I have no sight
 
I analyzed myself, I was buck wild
 Never thought about settling down
 But all the time I knew I was ready
 But not with all my friends around
 
But girl, I put you first now (I put you first now)
 You made me, helped mold me (Mold me, baby)
 Turned me into a man, I'm so responsible
 And I owe it all to you
 
My whole life has changed (My whole life has changed)
 Since you came in, I knew back then (come on)
 You were that special one (You were that special one)
 I'm so in love, so deep in love (Oh, oh, oh....)
 
You make my life complete (You make my life complete)
 You are so sweet, no one competes
 Glad you came into my life (So glad you came in)
 You blind me with your love (Blind me, baby), with you
 I have no sight
 
{God has blessed me} God has blessed me, baby
 Girl, He was good to me when He sent you
 {I'm so happy, baby}
 I'm so happy, I'm so happy, baby, oh, yes, I am
 {Share my world} Come and share my world, baby,
 oh...whoa...yeah. yeah
 {I'm so in love} I'm so in love
 I'm addicted to your love, baby, yeah
 
My whole life has changed (Oh, yes, I am)
 Since you came in, I knew back then (Ooh)
 You were that special one (You were that very, very special one)
 I'm so in love (You were that very, very special one), so deep in love
 
You make my life complete (You make my life complete)
 You are so sweet (Yes, you did, baby), no one competes
 (No one competes, oh)
 Glad you came into my life
 You blind me with your love (Come on), with you I have no sight
 
My whole life has changed (My whole life has changed)
 Since you came in, I knew back then (You made a difference in my life)
 You were that special one (I knew you were that special one)
 I'm so in love, so deep in love (When I first laid eyes on you, babe)
 
You make my life complete (You make my life complete, darlin')
 You are so sweet, no one competes (No one competes, baby)
 Glad you came into my life (No one, no one)
 You blind me with your love (No one), with you I have no sight (Come on)
 
My whole life has changed (Oh...whoa...whoa...whoa...)
 Since you came in, I knew back then