The only star

I don't know where you are,
or what you do.
I hope you're doing fine,
because I keep the thought of you.

Inside my heart, inside my mind,
throughout the precious breaths of life.
And when I need to drift away,
I take you with me on the way.

We play, and talk, and count the stars,
that fill the sky, and call them ours.
But only I know that in fact
you are the only star I keep in check.