Can't say too much because of spoilers but this song reminds me of Cloud's state in the ending of Advent Children

Neverending Story
by Limahl

Turn around
And look at what you see
In her face the mirror of your dreams

Make believe I'm everywhere
Living in your eyes
Written on the pages
Is the answer to our neverending story

Reach the stars
Fly a fantasy
Dream a dream
And what you see will be

Lives that keep their secrets
Will unfold behind the clouds
There upon the rainbow
Is the answer to our neverending story

Show no fear
Or she may fade away
In your hands
The birth of a new day
Lives that keep their secrets
Will unfold behind the clouds
There upon the rainbow
Is the answer to a neverending story

I never really paid much attention to the lyrics when I first heard that song, but it is fitting for Cloud and Aeris, eh? Thanks for sharing Kusari. :)