Why?

You don't understand why i'm crying these tears,
And you don't understand why i develop these fears.
I don't want to lose you,
But you don't understand,
You're slipping away from me,
Through my fingers like sand.
What happened to forever?
All our future set out,
I thought that you loved me,
And you'd always be about.
Why aren't you here now?
My hearts breaking down,
Why aren't you here to make a smile from this frown?
I guess you don't understand me,
I really thought you would,
And you're not wiping my tears,
Like i thought you should.
I love you so much,
I thought you loved me too,
What happened to everything we planned to do?
You're my one and only,
You always will be,
You're what i need to complete me,
Cos' you set me free.