Most of the people did not approve Yuki's behavior but on the contrary, I think it is normal. If my boyfriend hugged his ex and didn't tell me, I would get angry too. Naruse should have said that "I am sorry but she has her own problems so I was trying to help her" but he said something awful. Yuki is not sober and upset. Naruse should communicate more if he does not want to break up with her. Also, he realized his ex still has feelings for him but he continued to get involved with her. I am pissed.