You are.

You are the light of my life,

Inspire me, to be more that I could be,

Change me in a way that none could do it,

Time passed by, yet my heart stand still,

Until you come by, and everything change around me,

How could you not see it?

You are the reason for what have become of me.

For all the mistakes that I've done,

I regret it with all my life.

"I don't wanna lose you now
I'm lookin' right at the other half of me
The vacancy that sat in my heart
Is a space that now you hold"

I'm sorry dear.