Help Me Understand Chords

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Intro: G/C/D ... G/C/Em/D

(G) Once in A (C) lifetime (D)
(G) You'll open up your (C) heart (D)
Maybe, (G) once in your (C) lifetime (D)
(G) You'll swear to never (C) be apart (D)
You (C) think your love's on (D) solid ground
Then (C) out of the blue It (D) all comes (C) tumbling (G) down

(chorus)

(G) Who's gonna (G7) hold me (C) tonight When i'm (D) feeling lonely
(G) Who's gonna (G7) show me the (C) light Cause I (D) need to know
(Em) With all the (D) things we got (C) How can (Em) love just stop
(C) Tell me Somebody,  (D) help me (Dm) under (G) stand

(G) And my picture in your (C) locket (D)
(G) What will you do (C) with it now (D)
(G) All our friends and all our (C) memories (D)
(G) Tell me how we sort them (C) out (D)
(C) What's yours is yours what's (D) mine is mine
(C) Is all that's left after (D) all this (C) time (G)

(repeat chorus)

(F) Why I'm not part of your plans 
And you don't need me (G) anymore
Help me under (F) stand 
Why I still want to be where you are 
Even though I know in my (Am) heart 
That you don't (D) love me (C) any (D) more (G) 

(repeat chorus for the ending)