Any woman who has been drunk in a club toilet will be able to tell you that we have this innate capacity to bond, quickly and forcibly, with other women, even if we have absolutely nothing in common. But it’s not all sweetness and light; the spectrum on which female friendships exist is a vast one. On one end is this type of beautiful, unconditional encouragement and support. On the other end is unhealthy co-dependency built on manipulation and toxicity…