Matthew is your bully, he bullied you every single day. Which made your mental and physical health bad, so bad that you even tried to suicide. You went to therapy and they recommended you change schools, so you did

It's been years now. You have overcome your trauma. You came back to your hometown and decided to visit Matthew as he was your neighbour. When you entered his room you saw him surrounded by journals, and him writing one, with a pen in his hand. His arms are covered with scratch mark.