He is both excited and fearful after hearing the witches' prediction about his future because the witches told Macbeth that he would be king, and he is worried about his role in making the prediction come true.
I think it's best if you read it again so I can make sense.
Answer:
The Narrator's goal was most likely to inform the reader of what's been going on with Andrea and how He/She feels about the situation.
Explanation:
Based upon what's given you can infer that the Narrator is shedding light upon the situation.
Using paragraph details that support each other.