Answer:
1. Nick is confused and disgusted since he began to see the reality of the delusion and corruption of ethics that they live in (the fact that Tom is openly cheating on his wife and how Jordan is acting like a little girl and gossiping).
2. Tom emerges as a thoughtless manipulator. Nick has known Tom since college, but he learns that Tom is racist and perhaps even has Nazi-like beliefs on race.
3. We learn that he was in the service and that he went to Oxford. This is important because like Nick.... we are mesmerized by Gatsby's character and wondering exactly what is true and what