Why would a guy all of a sudden start flirting with a girl he never seemed interested in?

Anonymous

A friend of a friend never seemed interested in talking to me and never smiles at me. Today however he "accidentally" bumped into me and later stared me down when he was walking by. What does this mean and why does he do that?

Why would a guy all of a sudden start flirting with a girl he never seemed interested in?
14 Opinion