Why guy would call himself as brother?

Soo.. we are kinda in a situationship. He admit we are like a mix of friends and lover. Story cut short, we haven't met and talk for awhile (i never initiate so does he) then he call, we talking, then he say why i didn't reach to him for so long. I straightly said why should i. Then he laugh and was like “hahaha. Ermmm. Cuz im your brother” like?

Is he double friendzoning me right now?

Why guy would call himself as brother?
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