Unpopular opinion

In life, as in this manga, people can't find happiness all in the same moment, and in situations like that one or two "have" to suffer in the present time. As you can see from the kiss chap, or the first one, Nao suspects about the two, and Izumi either suspected his friend Eiji had feelings for her or she had feelings for him (because of how she's behaved in the kiss chap too). I think in life when you try not to see or run away, things are gonna cone back. So, I'm not saying it's Nao fault, but ... You know... Nao may be suffering, but Eiji also did and does suffer.. And Eiji was in love with Izumi waaay before Nao, si he is really torture for him.