Ah that was a very deeply touching chapter...I want to comment...
I have to say that I felt sorry about Kaname...living in a coffin for almost eternity, waiting nothing more than death, it's creepy.
What really happened there and made him so sad? I mean the death of a loved person can be tragical but the decision to terminate your own existence because of this loss is...extreme.
He obviously loved that woman so much that the loss was unbearable for him to go on (maybe vampires love so much, devoting their lives to their mates?)...
Kaname is very different in this chapter, he is no longer the sweet, onii-same who tries to cover the truth, make everything sound pleasant and elegant, he is telling the raw truth and he is trying to "kick in" some knowledge and notion in Yuuki's head about who he is and how he trully feels about the world around him and what lead him in despair.
In his mind he is afraid to face the same story all over again and Touma's blown, did not only shake Yuuki but him as well, making him realize that indeed that can be the case. He is so afraid that he may lose her that he sees no other option but to make her see the world from his perspective at once, even if that involves him uncovering his true colors and shake even her even more with the risk of him being "rejected" for his past.
And the way Yuuki also starts to realise that one year now she has not touched him, or get into him so he can feel "safe" to uncover himself is in a way I think both sweet and both sad.
I hope that from now on, she will simply start calling him "Kaname" and that she will forgive him for the fact that he hold back the truth. But he definetely has more explanations to give, lol onii-sama.