A he felt crime was his only way to achieve success in America
We don't have the excerpt, so we cannot really answer your question.
I can help you a bit, however, so if you've read the story, you will know how to answer it yourself.
A flat character is the one who doesn't change at all over the course of a novel, whereas a round character develops and changes his or her characteristics.
A protagonist is the hero of a novel, whereas an antagonist is his "enemy."
There are a few possible answers that come quickly to mind for this question. The first is that Nick is an extremely lonely person. Before the action of the novel starts (with his introduction to Gatsby and his rich lifestyle), Nick describes himself as being alone in a profession for which he holds no passion. He meets Jordan, who is certainly glamorous, but also has a sort of honest integrity about her absent from most of Gatsby's other guests. This is the second reason. He can tell there is something both childish and troubled about her, which suggests a depth he can't find in others, including his cousin. He has a story to tell, and she seems a person to share it with. Lastly, it's worth mentioning that he is attracted to her.
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During those months Rachel's mother looked after Aaron with something close to genuine fondness-- not pity, not obligation-- as though Aaron had become the son she always wanted.
This sentence flows very nicely and also makes sense. You can see that the punctuation is proper, the sentence makes sense, and the grammar is correct. With that in mind, that it the correct sentence structure.
