#askicepower

I agree that it was his breaking point in a lot of ways. It was the dam of resentment bursting open. Part of what had eroded their marriage so much was pride, which both of them contributed to. Draco had too much pride to communicate to Hermione his 1) frustration 2) hurt 3) loneliness, and the accretion of these emotions calcified into resentment. In that moment, it all comes rushing out. His injury, to him (and to readers, probably) symbolized all that he felt he had given up for her, and I think he felt further frustrated by the fact that she was still keeping things from him, at that point.