What is the relationship between Lan Yan's bosom friend and how to explain this word?

1, blue confidante means that women have male friends, and female confidante means that men have female friends. This kind of friendship is better than good friends, but it is worse than boyfriend and girlfriend. But getting along with such friends feels particularly talkative, has common topics and knows yourself, and can be called a bosom friend! This is the fourth kind of emotion besides affection, love and friendship.

2. Lan Yan's bosom friend is the fourth emotion besides affection, friendship and love, and it is an emotion for women. It's the relationship between more friends and fewer lovers. In her eyes, he is a very close good friend. Of course, he goes further than ordinary friends and can tell him everything. But it can only be maintained at this distance. There are other songs named after it.