We need to talk about this
because Yuuri's reaction in this scene is a result of his anxiety disorder and his tendency to self-deprecation and having depressive thoughts, and that he ends up here is being carefully foreshadowed throughout the series:
First, Viktor said a couple of things that made Yuuri believe that Viktor only wants to coach him until the GPF:
is enough to convince and anxious person like Yuuri that Viktor has no intention to coach him beyond the GPF. Note that Viktor never explicitly states that he will coach Yuuri only for the first half of the season - it's the natural conclusion an anxious brain will draw. And that's neither Viktor's nor Yuuri's fault.
And then this, while Yuuri is within hearing distance:
I'm getting a queasy feeling in my stomach just from watching this scene because I relate to Yuuri so much. If I had eavesdropped on this interview, I would have freaked out internally. Like what does that even mean? Is he talking about his career or is this a carefully crafted answer to convince the press to leave him and Yuuri alone for the next couple of weeks? This secret is probably between Viktor and the YOI creators alone (I have theories, but I'm not going to discuss them here because this post is about Yuuri).
Second, although he becomes more confident throughout the show, the self-deprecating part of Yuuri has a low opinion about his own skating. From his perspective, his contribution to the sport seems less valuable than Viktor's, even when he starts to understand that he's far more than a dime-a-dozen skater. The realisation that he is as least as talented as Viktor, only drives home the moment he breaks Viktor's world record.
Because Yuuri has such a low opinion of himself, he doesn't understand how much Viktor enjoys watching him skate, which is another aspect factoring into his decision.
Third, Yuuri genuinely believes that Viktor wants to return to the ice and would rejoice when Yuuri retires. Having seen Viktor watch the other skaters at the GPF cements the decision he made at the Rostelecom Cup. The fact that basically everyone has told him throughout the last 11 episodes that he's keeping Viktor from skating gives more weight to the idea.
Yes, you got that right. Yuuri deided to retire, before he proposed to Viktor and before he bought two matching rings and put one of them on Viktor's finger. However, now Yuuri knows that Viktor would coach him for as long as Yuuri wants to keep skating, which forces him to release Viktor from his duties at the point he believes Viktor wanted to stop coaching him initially.
Yuuri is not breaking up. He's releasing Viktor as his coach. He is sacrificing his career so that Viktor can keep pursuing his own career which Viktor once sacrificed for him.
Of course he's surprised that Viktor bursts out in tears.
Yuuri has the right to retire whenever he wants. He doesn't need to consult Viktor. If he thinks (for whichever stupid reason) it's time, he can make this decision on his own.
Lol no. Only Viktor thinks it is because he's conflating the coach and the partner and takes it personally. He's hurt and feels rejected because he doesn't understand that Yuuri did it for him and that causes a drama Yuuri was not prepared for.
Absolutely. But poor communication skills, Yuuri is too caught up in his mental issues to even think of having a discussion that would lead them to a solution with which both would be happy (both training in St. Petersburg *wink* *wink*). It's not malice, insensitivity, or shitty behaviour that drives Yuuri to this point. It's all about his mental issues. And love.