That's probably some of the best writing in the series so far. This series has always had the knack for the surprisingly subtle, but holy shit is this flooring.
The skirting around the obvious, the relief but also the grief, the way you can tell both know exactly what was happening at the end, even though nothing was said. Yuan knows. Throughout it all, he knows, and you can tell he knows.
This is realistically written heartbreak. Genuinely loving someone who does not and cannot love you back, but who is still wholly supportive and wants the best for you. It's hard to go through.
God, I love this chapter.