Here are a couple of things I found in my research:
- Women are biologically predisposed to bond very strongly with other women, and
- Women are not as biologically suited to the fight or flight response in face of danger, because a woman who is either pregnant or has small children can not do either as well as a male. Which is why women are predisposed to band together to protect each other from danger.
Can you see, then, why men believe that women collecting together can undermine his domination of a particular woman? That is why brutal husbands socially isolate their wives from friends and family. That is why certain men become very suspicious of women gathering together.