What does it mean when a guy calls you "bro?"

Anonymous
OK so I was talking to this guy I like 2day and I said hey what up and he says nothing bro, and it confused me because don't guys call other guy bro, I didn't think guys call girls bro? does it mean he thinks I'm a dude because unless I got this chemistry thing wrong I'm not a dude.
What does it mean when a guy calls you "bro?"
3 Opinion