This question involves many aspects of emotions and psychology. I can't give a definite answer. The boy wrote that he loved that person for the rest of his life, probably because he wanted to express his heart and promise to get the other party's approval and response. However, if the other party did not like him as a boy, he might feel lost, depressed, and desperate. Love is a complex emotion that involves many factors, including each other's feelings, personality, family background, and so on. Even if two people were in love, it did not necessarily mean that they would be together. If this boy really loved that person, he might try to understand the other party, communicate with the other party, and strive to understand and recognize each other more. Of course, this boy might also gradually let go of his emotions and focus on his life and career. No matter what he did, he needed time and space to deal with his emotions and find his own happiness.