Why did his brother do this?

my guy best friend has a brother who confuses me with his intentions. the brother is usually around us (me and my friend) whether he is there in person w my best friend or otp w us as a 3 way.

my best friend says he asks about me a lot to him and he even acts like a wingman to my friend when he's with him and i call... as if my friend likes me.

he's much older than the both of me and my friend by 10 years.

the brother recently added me on snapchat too... I don't know why.. but he did and i'm not sure what any of this means.

do they think i'm a pass around? does his brother like me and he's helping? why watch me on snapchat?
Why did his brother do this?
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