Why would someone say "I missed you" after a long day of not talking, when she had the capability of doing so?

If you miss someone you could simply talk right? Instead of waiting for a long time and say "I miss you"?
Why would someone say I missed you after a long day of not talking, when she had the capability of doing so?
Why would someone say "I missed you" after a long day of not talking, when she had the capability of doing so?
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