how will you know if your friend is gay?

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i juat had coffee with my friends last night we had chat things about our journeys and suddenly came up with a topic about our guy friend who thinks he's gay. i dont have any toughts or idea about him being gay. honestly he's goodlooking and i dont have any clue or hint that he's gay. no one knows, they just think he is. I dont really know, Its just that I cant rid thinking about him after. I was looking back on the past while we are together and I know he is not. Im not sure really. my friends are telling me that he has an aura being gay. Its not because of his looks and his gestures or the way he speaks. Im jut confused because he really is a man. I dont really know. I just cant figure out how they cme up the tought about him being gay. i hope you can share about this. I just want an answer or your opinion. thanks!:)