think i might like my brothers bestfriend!! should i tell him?

me and my brother are super close, always have been. I am older then him by two years and his bestfriend is a year older then him, makes it weird because i remember almost growing up with him (one of my close friends is his cousin aswell and iv known her for about 10years) i used to always think "just one of my brothers dorky friends" LOL i seen him a few months ago when i took him and my brother to a party with me and i did notice that he kept staring alot but i thought it was just because he hadnt seen me in a few years, but then i noticed it again a few nights ago. i dont know what it is but i think i kind of like him lol i was going to tell my brother but i chickened out and decided not to

what do you guys reckon? if your sister was to like your bestfriend would it bother you that much? lol or would you be ok with that

oh god - that could be awkward. let's say things don't work out between you and his best friend, might make things between them weird. if you tell your brother he might beg you not to ... but if something happens before you tell him, well...