And now it's clear as this promise
That we're making
Two reflections into one
Cause it's like you're my mirror

from Justin Timberlake – Mirrors Lyrics on Rap Genius

This song is about Jessica, Justin’s wife. The promise he made her when he made her his wife.

When you find someone special they are often referred to as your other half, a reflection of what you want to see in yourself. When they got married, they became “one”, instead of Justin and Jessica, they’re the Timberlakes

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