The characters are J.K.'s.
Severus noticed how beautiful she was, even when she was crying. Glistening tears fell down her pale skin, unto her lap beneath her. How funny is it that he notices these things now, when it's too late? And how he can't concentrate on what she is saying, only on these random thoughts. Why can't he pay attention to the most important thing in his life?
"I'll always love you. But I can't deal with this. And I'm going to move on; I have a date Friday night. Don't try to find me. If you really need to speak with me, go through Molly. When you realize what you're missing, I won't be waiting." Hermione took one last look at him and whispered over her shoulder as she walked out, "Everyone always wondered what I saw in you, now I don't even know."
He saw her walk out, leave forever. He wanted to yell, to plead, anything to bring her back. But he didn't, he couldn't.