hmm if he keeps lookin at u or acting nervous around u every time u tawk to hym or some lyke dat.

if u dont talk to her---she would always stare or if ur standin kinda close her friends might say somthin or like nudge her to show her ur there(my friends do that to me all the time!lol)
if u talk to her----well i dont know much about this one but i talk to the guy i like and i kinda stare sometimes but its not on purpose it just happends bu the usually dont notice.....ummmm i guess thats all i know...