Why does it bother me when a guy leaves me on "seen" but with my girls I don't mind as much?

Even if I don't ask a question and just made a comment about something, sometimes a guy will or will not reply. Girls tend to reply usually to everything I write in my chat. Any suggestions on how to stop being bothered about being left on "seen" ?
Why does it bother me when a guy leaves me on "seen" but with my girls I don't mind as much?
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