Harry still doesn’t know how it happened, why did he let it happen, why he didn’t try to reach out to her even when he knew she was in pain. A part of him knows why, of course, he just doesn’t want to admit to himself that in a world that was slowly rebuilding itself, it was uncomfortable to stay close to her, not when she was still in so much pain, even after months. Even Andromeda, who has lost both her husband and her daughter, has gotten better before Hermione.