How do guys react if they know a girl likes them but they don't like her back?

Anonymous
imagine ther is this girl and you know she likes you but you like her as a friend or not at all...

how would you behave arround her or if she starts flirting?

(are there some signs on which you can tell even if the guy is really nice to anyone?)
How do guys react if they know a girl likes them but they don't like her back?
3 Opinion