Having a "crush" on a friend

Okay...I'm the sort of person who is more a friend than family man, I care loads about my friends, love being around them, love to chat them e.t.c

For my best friend Sam, I tell him sometimes how I feel about him which is just that he's a really good friend, supportive e.t.c

Someone told me today that they thought that I fancy him (I don't) and I'm not sure if he does think this but how should I tackle this? (I am bi btw)

I'll tell him I don't fancy him but I am the sort of person to tell others how I feel so it's "just me" saying things, I don't have relationship feelings for him.

Is it just me (pardon the pun ;) )