I think that it is very difficult for a woman to have a close friendship with a man ~ especially if he is married.

If you work together, then you can chat at work, but, otherwise, I have found that it is virtually impossible to be anything more than distantly friendly.

I have argued on here, before, that platomic friendships are perfectly possible ~ not that everyone believes this ~ but in practice it can be very difficult.
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"The secret of success is constancy to purpose" - Benjamin Disraeli.