The key of the song is in Db Major (or C# Major?). The Gb9 chord can be replaced with
Gb, but I don't think it sounds "full."  Keep in mind that I figured out this song in 5 
xD

(The song starts off with the chord progression found in the Chorus)

Verse Part 1:
Gb9Don't (xx2122@1)think we ever really got it right
DbBoth (x43121@1)you and I have always kept it bottled up inside
Gb9Can (xx2122@1)you show me what it feels like to give yourself away
DbWhy (x43121@1)can't I hold onto you [Why can't I hold on to you...]

Verse Part 2:
Gb9There's (xx2122@1)no one around who picks me up when I'm down like you
DbDo... (x43121@1)Gb9And (xx2122@1)when you can't hear a sound will the silence drown you
DbToo... (x43121@1)
Chorus I:
Gb (244322@1)        Bbm (x13321@1)         AbWho's (xx1114@1)going home with you tonight? Was it real or am I
Gb (244322@1)         Bbm (x13321@1)       AbPart (xx1114@1)of your collection? Have you crossed the line?
Gb (244322@1)        Bbm (x13321@1)         AbWho's (xx1114@1)going home with you tonight? Oh I feel like you're an
Ebm (xx4342@1)     Gb (244322@1)       DbOpen (x43121@1)invitation. Is this how we say goodbye?

Verse Part 1:
Keeping secrets somewhere down below
I wish you had the heart to tell me that you sold your soul
So many things you couldn't let me know
You had to run away
Why can't I hold onto you

Verse Part 2:
There's no one around who picks me up when I'm down like you do...
and when you can't hear a sound will the silence drown you too...

Chorus II: (Same chords and progression until...)
Who's going home with you tonight?
Was it real or am I part of your collection?
Have you crossed the line?
Who's going home with you tonight?
Oh I feel like you're an open invitation
Is this how we say goodbye...
Gb (244322@1)       Bbm (x13321@1)          AbWho's (xx1114@1)going home with you tonight? [Good-bye] x2
Gb (244322@1)        Db (x43121@1)                         AbCan (xx1114@1)you tell me what is wrong and what is right?
Ebm (xx4342@1)      Gb (244322@1)           DbWho's (x43121@1)going home with you tonight...

Bridge:
Gb, Db x2

Gb...It's (244322@1)getting harder to sit here alone
Db...And (x43121@1)I've been waiting I've been waiting and you still ain't home
Gb...I (244322@1)have never ever felt so low
Db...And (x43121@1)I've been thinking I've been thinking Oh where did you go

Repeat Chorus II