Boys are simple and honest, why should they pretend to be cynical in front of a girl?

He also deliberately pretended to be cynical, perhaps to let the girls see it. This is his personality. He hopes that girls can like him like this and like his style. If he deliberately pretends to be cynical in front of a girl, it means that he may not be interested in this girl at all, so she is showing it to others. I hope my answer is helpful to you. Thank you!