In addition to all this, don’t forget one thing: If we know one thing about Yasu, then it is that she is a terrific actress to keep this charade going for so long and that she regards her personas less as aspects of herself, but more as characters she has to play in order to please the people around her (or at least that’s her main objective when she’s Shannon, like I said before, Kanon has more leeway). And in any case, she never breaks character. If she phrases things oddly in a way that could be taken as a hint, then she does so always in a way that is in-character for whomever she currently acts as.
Knowing that, I find it very difficult to blame George for anything. There are two reason: First, we get to know the two of them at a time where they are already a couple and second, never forget that the entirety of Umineko is a work of in-universe fiction that is subject to the bias of the writers. When just looking at the first two episodes, George isn’t portrayed in a very flattering light. He tends to play the class card to make Shannon do things she is reluctant to do and even in his proposals he is forceful and proudly displays his entitlement. Yasu obviously has a very cynical view on him and the way the narrative emphasizes what an awesome dude he is kinda sounds like mockery when contrasted to the way he speaks. This leads me to think that even though the later episodes claim that she does have feelings for him, Yasu herself might just go out with him because she thinks that is something Shannon would do. Because in her mind, Shannon is a different entity than herself. And take everything that is stated later on with a grain of salt, because Tohya knows virtually nothing about how they got together and tends to portray everyone in the best possible light.
This long ass rant was necessary for my next point: What if George would have straight up asked her what’s bothering her? Since we don’t know how they got together, it may be very well possible that he did. And here comes Yasu’s crippling turtle tactic into play: Because she never breaks character, she cannot allow Shannon to talk about things concerning Yasu’s state of mind. Therefore even if he did ask, I am 100% sure that Shannon would just assure him that everything’s fine, if she didn’t even already do that sometime before the story begins.
This kinda reminds me of a different story with a far better adjusted character who did the same thing… Any Sense8-fans here? In a way, Yasu’s fear of rejection and of not being understood that leads her to totally deny herself when interacting with others is somewhat similar to Kala’s storyline there. Kala is obsessed with pleasing the expectations of everyone around her and somehow slithers into an engagement with that absolutely awesome guy Rajan, who has fallen totally for her, is super attentive, extremely fun and not to mention filthy rich, but she doesn’t really love him and just keeps the charade going because she wants to please him and her parents. At several times in the story he does notice that she is clearly uncomfortable with what he’s doing for her and flat out asks her, again and again, going even as far as suggesting to break up, but she always assures him that she’s happy and everything is fine and that he has no reason to worry and along those lines she pretty much trains him to overlook all the glaring signs that something is wrong. Why does she do that? Because she’s extremely afraid of this house of cardboards breaking down, she is afraid of the change, of the disappointment and of course of how people will react!
And that’s fucking Shannon! Down to the letter! That’s why I am so cynical to believe that even if outright asked, Yasu would never just tear down her walls, but instead hide behind them, like always. Keeping the charade going, like always. George may have been not as flawless a guy as Rajan in how he dealt with the signs, but even if he did act upon them, it is doubtful that it would have changed much. Heck, it is very likely that he did and Shannon simply trained him to overlook everything, similarly to what Kala does in Sense8.