Why is everyone mad a Naruse. Ok so the girl hugged him for emotional support, nothing sexual and he has no feelings for the girl. In my opinion she is not even on his mind. So he said that the girls "personal problems" that he knows about have nothing to do with Yuki, and in all honesty they don't. He doesn't gossip so why would he flap his lips about it. Second, Yuki has been in many situations and been hugged by Hakamada more times that Naruse actually knows about, and she constantly feels like he should not worry about it. But this is a dude that has shown that he is in love with her and has intentions towards her. Next, she pushed him away and basically told him to leave because she "feels" like he is thinking about that girl, he never said that he did. She gave him the idea to go check on a girl he was not even thinking about, then gets sad when he does. She should not be testing him at this point in their relationship. Also Usami was wrong for involving Hakamada, she knows how he feels and this is not the first time her loose lips have caused issues. I wonder whose side she is really on, especially after all Naruse has done for her.
Just my 25 cents.