The Question and Answer section for Where Are You Going, Where Have You Been? is a great resource to ask questions, find answers, and discuss the novel.
This relates to Arnold, He causes conflicting emotions of both fear and desire. She sees him as a "blur" and feels uneasy when even thinking about him.
I'm sorry, I see no evidence of a story by this name.
I'm sorry, there is no character named Alex in Where Are You Going, Where Have You Been?, and I see no evidence of a novel entitled North and Feaust.