Boy bestie?

Sydney • Here to help all those in need- of a tampon.
My best friend is a boy and we are super close.  I think he likes me though, like he always asks if I'm dating someone and he always is super protective around other guys.  Like I was talking to someone and he took me away making up a lame excuse. What would you guys do? I don't like him back, he's like a brother to me.