@Decormad
Do I think it’s a bit pathetic when women write 'worried my dh has a female friend at work... Yes!'
What a horrible thing to say. 
Some women are just genuinely insecure and worried, that doesn't make them 'pathetic!' 
You and a few others on here sound like the sort who latch onto a married man and become their 'best friend' (in your mind anyway!) and scoff and sneer at the man's wife when she gets a bit stressed about it.
If anyone is 'pathetic' it's a married man who has a little female hanging around him, (claiming that they're 'BFFs,!) And so is said female who claims 'we are BFFs and I can't help it if I get on better with men!' 
Seems to me like the female is trying to make herself feel good with her 'cool platonic relationship' with her married male friend, and HE is trying to make himself feel good by being BFFs with a female. And BOTH of them think 'to hell with how the wife feels...' As long as they have their amazing cool friendship eh?
I know someone who had to put up with this shit for YEARS from her husband. He seemed to have a different female BFF every year at work, and was often their 'shoulder to cry on'. These women were almost always single too ... Several of them got quite attached and used to text and private message him on facebook etc. Also went for coffees and beers after work. No matter how much his wife said it was making her unhappy and insecure, he said he 'can't help it if he gets on so well with women!' And as you always find in situations like this - the women didn't give a shit about her.
After about 15 years of him behaving like this, she met a man at a hobby group who she got on with very well. Handsome chap-7 years younger, and recently widowed. You can probably guess what's coming next.
She became pals with him, and had a coffee with him a couple of times after their group, and her husband nearly had a meltdown worrying about his wife with this man. After a few weeks he told her he didn't want her going to the hobby group anymore, or seeing this man.
She told him to fuck off. She said after all the years she has put up with him and his 'friendships' with various women, he had no RIGHT to tell her to stop seeing her new male friend. She carried on, and nothing happened with this man, and after 6 months, he left the area, and she and he lost touch.
Weirdly, after that, her husband never had any more female friends.
Just needed a taste of his own medicine! Personally I would not have tolerated it for 15 years and thought she deserved better.
I think the majority of people will not be comfortable or happy with their husband or wife being very close to a member of the opposite sex, (especially if there has been a proclamation that they are BEST FRIENDS.) I think it's very odd for a woman to claim that another woman's husband is her best friend. His WIFE should be his best friend, not you. And I bet he doesn't tell ANYone that you and he are 'best friends.' It's only you saying that! 
The film 'my best friend's wedding' springs to mind, where a single woman was devastated that her 'male best friend' was marrying another woman. She couldn't bear it that another woman was more important than her, and did everything she could to stop the wedding.
Even though the circumstances are slightly different, there are a few women on here who sound like that woman who was miffed that this man was not her best friend anymore, because his WIFE now was. As I said (and some others have,) I find it very odd and weird when a woman claims her 'best friend' is someone else's husband. WTF? 
There is nothing wrong with being FRIENDS with a married man (when you are a woman,) but the ones who claim this married man is their BEST FRIEND are questionable, and I do question their morals - and motives.