I have a rule I've developed after a few experiences that I will likely never again befriend a female who is single. I've discussed this with some of my female friends and they agree with me about how females tend to be loyal to just one male at a time. And so what I found a few times is that the single females who became my close friends, who might pretend to be my very dear friend for even many years, would dump me when they finally found a male sexual mate.
Essentially, they were using me as their surrogate husband while they didn't have a real one. The last one who did this to me started off as one of my professors. We'd become really close friends for more than five years. My partner & I used to take her boating. She ate holiday dinners at my mother's table. I had stayed with her at her parent's house on one of our vacations together.
Then she met this guy. He and I got along perfectly well. They married. Then she started pulling away from me. Even her husband didn't understand it and volunteered to me that he had tried to get her to continue her relationship with me. I spoke to her about it. She admitted that she was being a bad friend but said she couldn't help herself. It hurt like hell and I will never put myself through that bullshit again.
I'm not antiwoman. My own mother was a wonderful person. I've got a female friend coming to stay with me for a few days next week. I've got female friends that I've had in my life since the playground. And I know that guys can do similar things. But at least in my experience, I've found that in their tendency to be loyal to just one man, females particularly can be disloyal to others.
So the girls I like best are the ones who are not seeking a husband or an escape from their husband but who seem capable of maintaining a friendship with a friend. In a sad catch-22, that probably means that if they don't have existing male friends, it could indicate they've already dumped them all & I'm not going to be their next.