he doesn't realize his own blame because he just does the first thing that come to mind because other people tell him it's "ok" (it's not actually ok)
"Other people" not exactly. Seki proved very clearly the only people able to give orders to Yuu how if he was a dog, they are Hikari and Yami. Maybe Yuki will join to that club seeing this chapter.
And yes, he has been all this time the dog of Hikari and Yami. Female domination and all that, as I already said it. Greetings for finally discover it.
So, Yuu taked a decision (in a bad way, but he really did it, this boy is not Nukumizu from Makeine) and he has been faithful to that decision, is Hikari who rejected him and freed him from that decision.
They're not blaming him by telling him where he screwed up in all this and they literally tell Yuu the reasons he's an idiot, which: (1) it was wildly insensitive of him to go see Aya alone if he was in love w/ Hikari, even if Hikari told him to, but Yuu never thinks 2 steps ahead on how his actions will effect other people, which Aya also yelled at him for
The reason Ayami complained was that she realized—as this chapter confirmed—that everything happened on Hikari's orders and was manipulated by her. That is what truly angered her, as seen in her reflections in Chapter 50 when she realizes Yuu is messaging Hikari by phone.
Otherwise, it was amusing to see the girls grudgingly accept that Yuu was right and that Hikari was primarily responsible for explicitly sending him to see Aya, fully aware of the risks involved. So yes, this brings me back to the topic of misandry and the expectation that "since you're the man, you're the one who has to fix this, even if you didn't cause it."
So far, Hikari and Yami have been the ones primarily responsible for everything that happened. Yuu's fault lies in allowing himself to be manipulated and mistreated by those two toxic, miserable, selfish, crazy women. He has zero self-respect or dignity.
(2) even after all of this, he's still saying/thinking he's not important enough to Hikari for her to remember places they have memories in, which that insecurity is what kick started/underlies basically all his decisions that led here.
Yes, this is the one area where we can genuinely blame Ta-kun, and it is his only real, major flaw, and the girls are totally right to saying it to him in the face. The fact that this factor was far less decisive than it appears is due solely to the following:
1) Hikari is incredibly insensitive; after all, her reaction to everything that happened was to go out and look for Aya.
2) Yuu is such a coward that his inferiority complex actually prevented him from making decisions that would have made things even worse—except, of course, for chapters 36–38. It was precisely his weakness who made possible his relationship with Yami in first place, and again, without that relationship, HIKARI WOULD NEVER FELL IN LOVE WITH YUU.
Even the events of the recent chapters were more of a desperate, last-ditch effort than anything else; Hikari knew full well that this would likely happen, yet she didn't seem to care much that Yami ignored Yuu's desperate offer. Rather, Hikari finally seems to be savoring what Yami had felt ever since meeting Yuu in chapters 22–23: the pleasure of loving a pathetic man.
Hello, Haruki Kitahara; hello, Yuu Izumi.
I will share my thoughts on the latest chapters in greater detail later (IMO, I will bet for Yuki to win the Yuubowl).