What is the main conflict in Disgrace by John Maxwell Coetzee?

David Lurie is a professor of Communications at Cape Technical University in Cape Town, South Africa. He is a middle aged man, twice-divorced, living alone. He finds no pleasure in his work. His previous position was in modern languages, but his department was eliminated and now he teaches students something that he is not particularly interested in. He is a lonely man, and finds pleasure in going to a prostitute every week. One day he sees the woman, Soraya, in the city with her two sons, and shortly after that the prostitute stops working at the brothel where David frequented. He is now left alone and lonely.