i'm sorry

The story is a part of book seven, so if you haven't read it yet, don't watch and don't read further...
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Ron leaves Hermione and Harry when they're on the long way to Voldemort's horcruxes. He leaves the tent, leaves Harry and leaves...Hermione! She is sad and angry...Ron realizes that he made a mistake...Later he comes back and talks to Hermione. In the book he doesn't do that, but here, he tells Hermione, why he's so sorry.......