"Forever the Side Character"

I stood on my balcony, a witness to your love,
Watching you hold the car door, tender as a dove.
Your lips on her forehead, a gentle goodbye,
A knife twisted in my gut, tears I couldn't dry.

You'd leave, and she'd wait, a constant heart,
Your return, a warm embrace, a love to restart.
I'd turn away, hiding tears, pretending not to care,
But the pain lingered, a weight I couldn't...