A song I've started... Any help with lyrics or title would be MUCH appreciated...

(Backing Singers):
Wor-orld's apart, Wor-orld's apart,
So far away, So far away,

(Lead singer):
You and I,
Used to be so close, (So close)
Now your heart belongs to someone else, (Someone else)

(Ohh-ohh,)

Why do I try to get you back?
You were never even mine,