Is it okay if your girlfriend / boyfriend has a close friend from the opposite sex?

They chat for hours.. They can tell each other secrets.. They have chemistry and know how to lift each other emotionally.. How to entertain each other... but they don't go out together... Alone... not Without your permission / approval at least... and of course they don't do any inappropriate physical stuff... would you be okay with that? Do you think it would " blossom" over time?

Is it okay if your girlfriend / boyfriend has a close friend from the opposite sex?
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