How is Coles remorse and guilt for his past actions showing itself? only from chapter 13

Cole again had vivid dreams of his family and friends helping him but also taunting him for being so weak and helpless. Rosey and Garvey talk to Cole about the healing power of serving others, as Cole remains bewildered at why these two spend so much time helping him but is beginning to appreciate people who care. Cole also understands that the world will now have to trust him. He will no longer manipulate people. When the medivac plane arrives the next day, Edwin and Garvey ask Cole what happened on the island, and Edwin simply can’t believe that there was a real Spirit Bear on the island because normally they live hundreds of mile south of Drake. While Cole has the tuft of white hair in his jean pocket, he commits to telling the truth and asking the two men to trust him. When they are not looking, he throws away the white tufts of hair. The world will have to take Cole at his word from now on.