Can u help me?

Last Sunday I was at work & I saw my friends gay friend there. He's a guy but l'm not sure if he knows me & if he told her about me that he saw
me at the fast food place. then later when I went to my friends Instagram account I saw that she put a 🏳️‍🌈 in her Instagram bio. Do u think she put that 🏳️‍🌈 in her Instagram bio for someone to know she's bi? But she's engaged to a man.