What is what does it mean when a guy calls a girl bro?

When a guy calls a girl "bro," it could mean that he considers her as someone who is close to him, almost like a sibling. It may also be a sign that he is not interested in having a romantic relationship with her. The use of the term could indicate that he sees her as a friend rather than a potential partner. However, context and tone of voice can also determine the meaning behind the term. It is best to understand the nature of the relationship and the intentions of the person calling the girl "bro" before reading too much into it.