In the last chapter they as adults dropping their children off to board the hogwarts express. They see each other and Draco nods his head at harry to acknoldege him as to show respect but it is never indicated that they are friends.
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No, these two do not become friends. The last seen of them is in their late thirties, where they merely acknowledge each other.
Harry saved Draco's life during the battle at Hogwarts. Later in the epilogue there is a brief recognition between Harry and Draco. It does not appear that they are friends, but they do seem to have a mutual respect for each other.
During the series they hated each other however, at the end they were at least civil to each other due the the Malfoy family changing sides at the last minute and Harry helping them avoid Azkaban (not to mention Harry Potter saving Draco Malfoy's life twice).
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No, they hate each other. At the end Harry Potter and Draco Malfoy have come to a sort of civil agreement (probably because Harry saved Draco's life twice and Draco's mother saved Harry), so it is likely Ginny Weasley also has some respect for Draco.
there is no song