What kind of relationship between a man and a woman is a pure friendship?

I think at least one of the following conditions must be met before men and women can remain friends.

1. The man and woman each have their own lovers, and they are in true love with their lovers, and their relationship is very stable and strong.

2. The other party has shortcomings that you cannot tolerate. For example, a boy and a girl who are friends play together because they have the same interests and hobbies, such as playing games or photography, so they often communicate and discuss together. In this regard, they are very compatible. But at the same time, the girl may disapprove of the boy's character and feel that he has no ambition and only knows how to play all day long. And this boy may think that this girl is particularly money-worshiping, or that she looks too ugly. These shortcomings do not prevent two people from becoming friends, but if they want to further become lovers, both men and women find it unacceptable. After all, lovers have much higher requirements than friends.

3. Both families are very familiar with each other. For example, the man's father is the brother of the woman's father's brother's daughter-in-law. The two are not related by blood, but they are still relatives, so they have met frequently since they were babies, calling each other brother and sister, and they are very familiar with each other. Legally, you can get married, but emotionally and psychologically you feel extremely uncomfortable, so you can't develop anything other than a friendship.

If a man and a woman both admire each other and feel that the other person is not only excellent but also to their liking, then from my point of view, it is unlikely that they will become pure friends. Maybe they will develop into confidants/girlfriends, both of them secretly like each other, and occasionally engage in a little ambiguity to spice up their lives.