Im a fem gay guy 24 and my straight pass guy friend 29 wants to introduce me as his brother

A little about me I'm queer neurodivergent and have bad axiety, what an orginal combination. We met on grindr and hooked up once and decided we were better off friends. Hes become my closest/only friend within the last six months hanging out a couple times a week

My friend and I have made plans to go to this techno club. He called to confirm the tickets but also said when we go out, he'd say im his brother.

Ive been spiraling for the last couple of hours, do you think he's embarrassed to be my friend or that we're just so close that he thinks of us as brothers?

Please ill take any advice, but will probably talk to him tomorrow about it