How does Chapter 7 use tension to achieve a horrific climax (Myrtle's death)?

think that everything hits the fan, so to speak, just before Myretle's death.

Although Tom is himself having an affair, he is furious at the thought that his wife could be unfaithful to him. He forces the group to drive into the city: there, in a suite at the Plaza Hotel, Tom and Gatsby have a bitter confrontation. Tom denounces Gatsby for his low birth, and reveals to Daisy that Gatsby's fortune has been made through illegal activities. Daisy's real allegiance is to Tom: when Gatsby begs her to say that she does not love her husband, she refuses him. This is important because situations, long hidden, have been put out in the open. Affairs and accusations are tossed around. This doesn't add closure to the situation rather than it ramps up the tension. These are not characters that do much soul searching. They keep their frustrations hidden under the guise of polite society. Even after the confrontation in the apartment, there is still manipulation going. Tom, for example, permits Gatsby to drive Daisy back to East Egg; in this way, he displays his contempt for Gatsby, as well as his faith in his wife's complete subjection. When Myrtle is hit and killed by Daisy's car one wonders how the tensions played into it; we wonder if this was in some way the inevitable result of a very dysfunctional society.