I've been thinking about you all day long
Hoping you pick up your phone

from Justin Bieber – Heartbreaker Lyrics on Rap Genius

Meaning

In an intimate and long term relationship if the couple is busy and not always together, they will keep the (best) memories of the other person or a keepsake of their’s on them.

Making time for the other party is something that keeps the relationship working, and not the cause for conflicts.

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