what are the chances that your BIL fancies you?

Huh!??! Weird question. Why would anyone look out for signs that their BIL has a crush on them?

I would say don't be close friends with your BIL in the first place... that is so weird.... being close friends with them.

I have 3 BIL's and I lived with my in-laws for 4 months after my shaadi. I made sure I was never alone with any one of them EVER and never struck a friendship even though I love the youngest one like my brother, I'm very fond of him but I never show it openly.... koi bharosa nahin koi kiya samajh lai..... these are very delicate relationships.