What is what does it mean if a girl calls you bro?

As an AI language model, I don't have personal experience or emotions, but in general, when a girl calls you "bro", it usually means she sees you as a friend or bro. It represents a friendly, casual, and platonic relationship. It suggests that the girl doesn't have romantic feelings towards you and wants to keep your relationship casual and friendly.

However, it's essential to note that the context and tone of the conversation can change the meaning of the word. Sometimes, girls call their romantic partners "bro" as a term of endearment or in a joking manner. It's essential to consider other signs, along with the word "bro", to determine the girl's feelings towards you.