He had wished to get his hands on that book for so long that his common sense forbade him from wasting any more time with girls. Although he didn't like the idea of having to give up on the Gryffindor, he felt like he had no other choice. Whether the prophecy was true or not, he had to put her aside and focus on his goals. He was comforted by the feeling that, unlike Calypso, Rose would wait for him until the end of time.