From Part 8, Chapter Twenty-One, Sword Art Online volume 18
I’ve read what anon said to @transboykirito and @kiri-thirsty that Asuna would get jealous with Eugeo because he lived too long with Kirito I was in a total WTF, then I realized that the anime erased way too much of original Asuna’s narration that viewers completely misunderstood her entire character. How I am too saddened, because when we say Asuna & Eugeo would be besties if he lives, it’s not baseless at all, you know.
Asuna realized that Eugeo is the true important one to Kirito when she was in a debate with 3 other girls who came out of nowhere claiming their relationship with Kirito is any important, because Eugeo’s name was repeated too many times in those 3 girls’ stories, which means he is truly by Kirito’s side longer than any of these girls claimed to be.
Asuna knew this person’s name, because it had come up over and over again during the night she’d spent trading stories in the tent with Alice, Ronie, and Sortiliena: Eugeo the sword disciple.
And yet, Asuna is accepting that Kirito has a friend, a partner that special to him, just like who Yuuki is to her, and is sympathizing with Kirito’s deep sadness over losing Eugeo.
Kirito, Asuna thought, watching him hold the black sword aloft, I can’t imagine what kind of horrible, heartbreaking things you went through. But I can tell you this: Your friend still lives on inside you. The same way that Yuuki still lives inside me. And that memory will bring you strength. Strength to pick up your sword and fight again.
Another part that is unclear in the anime is that Asuna actually saw Eugeo’s “ghost” appearing & helping Kirito.
Also this scene in the epilogue of WoU nailed it too, since blue rose is Eugeo’s symbol, when Asuna brought it to Kirito’s hospital, it signifies that Asuna accepts what Kirito has with Eugeo will forever be a part of Kirito as well as embracing his pain even in their intimate moment, that it will be a part of her too and she will stay with him through all this as well.
