At the End of Chapter Three...

Why does no one in the novel actually like Paris? They all talk about how dirty it is and how much they dislike it, so why do they live there? I don't understand that at all. Also, Hemingway introduces Brett who is basically a whore, pardon my French (hahaha...that was punny). She also annoys me, but not as much as Cohn does. She flirts with everyone. She leads Cohn on first and then turns him down for Jake on page 30 when she says "I've promised to dance this with Jacob." And Jake bounces from Georgette to Brett who he clearly has a history with in the same night. Hemingway seems to use the third chapter to emphasize the promiscuity which was not uncommon in the time period among young adults.