Shadows always leave us In the dark

It's 3am again and
with every car that passes,
It's headlights invade my room.
The shadows on my wall
are a silhouette of you.

I wait in anticipation
with every passing car,
as I lay sleepy eyed and
curled up watching you like art.

I know eventually It will
be light again and
you will be gone once more.

So then
why does my heart break
that I open my eyes
and you' exist no more?