Answer:
Dramatic irony is a form of irony that is expressed through a work’s structure: an audience’s awareness of the situation in which a work’s characters exist differs substantially from that of the characters’, and the words and actions of the characters therefore take on a different—often contradictory—meaning for the audience than they have for the work’s characters. Dramatic irony is most often associated with the theatre, but examples of it can be found across the literary and performing arts.
Cool beans and that’s not how you spell details
Although Nick was hypnotized with her voice and her story, once she finished talking he believed that she has cheated him, and that she has been pretending all the time, then he even said that she didn´t like Gatsby's parties because they were fake, they were for a momentary emotion.