@Nba RussianFan Why? Because she's still her girlfriend! Look at Natsume, a few chapters earlier she literally could piece 1 and 1 together to see that Fuuko was having something more than friends going on with Yuki. Instead of seriously confronting the both of them she ultimately just sweeps it under the rug after a talk that revealed and brought absolutely nothing. Yuki is incredibly bad at communicating simple things, but Natsume should be aware of that by now or at least have a method on how they can have a serious talk... which she isn't doing. She lacks the courage to even speak out against Fuuko due to not being able to proove anything. All 3 of them should stop. Yuki especially since she can't say what she thinks and only stays with Natsume now due to her own guilt. The only reason Yuki does tell Fuuko things more openly is due to Fuukos direct nature in bringing up such things... She pries until she gets an answer out of Yuki which Natsume can't.