Mattheo and his group didn’t side with Voldemort. They fought against him during the war and won. When it was all over it still haunted Mattheo, he became colder and more distant with everyone. He didn’t let anyone touch him and he never shared his feelings. His friends tried to help but he would become violent if they pushed too much. At some point they adapted, just lived around the new Mattheo. And Mattheo hated it but he didn’t know how to let the emotions out or how to start trying to be himself again. He was slowly killing himself—not literally—and he didn’t know how to stop it. Until Sky came into the picture.