2. Generally speaking, when a woman is interested in a boy, she calls the other person her brother. Another situation is that when she is interested in a boy, she will call the boy her brother. This is also reasonable and common. For example, we often see a couple, and girls call boys brothers. What's more, after some couples get married, the woman will still call the man brother.
3, coquetry with boys, want to be concerned by boys, generally speaking, a woman calls a boy brother on WeChat, and there is another meaning, that is, coquetry with boys, want to be protected by boys. In this case, the probability is also relatively large.
4, spare tire, generally speaking, a woman is called a boy brother, there is another possibility, that is, she regards a boy as a spare tire, and she will find a boy if she needs anything. But except when something happens, I will find a boy. At other times, I feel at arm's length with that boy, and I feel far away from that boy.