It would be devastating. If Hermione found out about what had happened between him and Rose, he couldn't imagine how she would react. She would be right to do so. Draco couldn't have predicted that Rose would have feelings for him, but he hadn't done enough to avoid it. His weaknesses had overwhelmed him. Feeling truly loved, unconditionally and intensely... He hadn't felt anything like that since Astoria's death. He couldn't give it up. 