Why would a guy talk about most of his online friends (females) but not one specific friend (female)?

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A guy i know talk about his online female friends but i know he has one another but he never mentions about her anything, he is keeping her secret why would he do that?
he even denied when i asked him if he know someone from her country
Why would a guy talk about most of his online friends (females) but not one specific friend (female)?
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