Answer:
This tells us that Nick is either afraid of her, or of ruining their relationship. Another reason why he might have not called her out on it is that he finds those things trivial and doesn't care enough. He doesn't want to call her out on it because it could hurt her feelings and cause her to be angry with him. If I were Nick, and if it was that important to me, I would have carefully asked her, but not outright or bluntly.
Explanation:
