In short—they were not meant to be. Hermione had already known this. They had been steadily working on that and coming to terms with it. It came as no surprise that he'd found someone else. What hurt was that he thought so little of her, cared so little, that he could stomach betraying her by falling into the arms of another and not even having the decency to break up with her before that. She had fought the war with him, she'd stood by his side for years, loved him for a decade.