Do all boys flirt with girls?

[Darren 蔡]

Shy or inexperienced guys may choke when talking to a pretty girl... hence cannot think of good lines to come back with to flatter her. It could be he's trying too hard to be mature and responsible, doesn't want to appear to be a player. Without seeing his interaction with you it's too hard to tell. Because it also could be that he isn't interested in a relationship with you.