The lyrics below described what happened between Cloud and Aerith in the games, and I believe what will happen in AC. Overall, it describes the support and love Aerith gives to Cloud, and how she helps him find the Cloud in him again.
This song is amazing. It makes me teary just listening to it on the radio.

You needed me - Anne Murray

I cried a tear
You wiped it dry
I was confused
You cleared my mind
I sold my soul
You bought it back for me (this reminds me alot of the situation in KH)
And held me up and gave me dignity
Somehow you needed me.


You gave me strength
To stand alone again
To face the world
Out on my own again
You put me high upon a pedestal
So high that I could almost see eternity
You needed me
You needed me

And I can't believe it's you I can't believe it's true
I needed you and you were there
And I'll never leave, why should I leave
I'd be a fool
'Cause I've finally found someone who really cares

You held my hand
When it was cold
When I was lost
You took me home
You gave me hope
When I was at the end
And turned my lies
Back into truth again (Ooooh bad tifa bad :P)
You even called me friend

You needed me
You needed me

It makes me teary eyed just reading it. I agree this song is amazing. Thanks for posting it!