Why did he suddenly friendzoned me?

Anonymous
During the day we’re joking and talking and keeping convo light. We call eachother occasionally. And at night we often get deep and he asks me a lot about my take on relationships. He even gets jealous (as a joke?) but it’s doesn’t seem like a joke when he thinks I like other guys. And some nights we even flirt and he admits I turned him on before with what I said. So why now did he say i’m “his bro”. What gives.
Why did he suddenly friendzoned me?
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