Yes, I agree, with you, and everyone gives up so easily. Taichi is human and we aren't perfect, and the fact that Nishina is using Nao's sadness to win him over, is something I feel people overlook like should that be anyway to actually make someone fall in love with you. Ugh, I'm so bummed out. I really hope Nao takes into consideration his relationship of years with Taichi over the small amount of time he's known Nishina, Nao can't move on that quick.
True, altho taichi is human and makes mistakes, the rape in ch 4 should have been a big ass deal breaker... Nishina is so much nicer, and nao cant be with taichi, he's too violent towards him.
Actually, why do people suddenly hate the main character? I think it's rather realistic to struggle with yourself because of your own sexuality, since some people do frown upon some preferences. Isn't it far too ideastic to expect that things will be easy for them? I believe that Taichi emotions and turmoil is the most human one can get.