A typical example that communication is not good for teenagers' physical and mental health?

There was a boy who felt some strange changes after he entered high school. He especially likes a girl sitting behind him and can't help looking back at her every day. His heart trembled when he heard the girl laughing loudly. There is a strange feeling. He is ashamed of this idea and thinks that he has gone bad; I was afraid that other students would make fun of me when they found out, so I tried to suppress my thoughts and not let myself go back. I had no choice but to cut my wrist with a knife. However, despite the scars on my wrist, I still can't help looking back. To this end, he became in a trance and finally had to consult a psychologist. There is a girl in a key middle school who has always had good academic performance, and her parents are proud of it. Later, in a summer camp in a province, she didn't take part in the activity because of illness. Another male camper who was in the same school as her, but never talked to her, took the initiative to care for her and help her. The two men formed a friendship. After returning to school, the relationship between the two became closer, from frequent communication to delivery of notes, and often met alone. Everyone is full of affection for each other and get along very happily. But before long, problems followed. First, academic performance plummeted, and then both parents gradually noticed the changes in their children. The matter was finally reported to the class teacher and the principal.