What does it means?

I have a guy best friend not something else but recently he posted on his story ASK ME ANYTHING... so I asked him WHAT WOULD YOU DO IF YOU WERE A GIRL. He replied that IF I WAS A GIRL, YOU WOULD BE MY BOYFRIEND IF YOU WERE A BOY... Now the problem is I don't like him the other way... So what should I do?
What does it means?
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