If you ever feel alone and
The glare makes me hard to find
Just know that I'm always
Parallel on the other side

from Justin Timberlake – Mirrors Lyrics on Rap Genius

Sometimes, a mirror reflecting light can make it hard for a person to look at it because the pineal gland can’t take it in, sending a signal to the brain that makes you blink or look away.

In terms of the song, whenever they are having a rough patch or he is away for a long period of time and she is longing to see him, he wants her to remember that he is thinking the same thing about her and that she should use that to get over the fact that he isn’t there with her.

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