My heart goes out to you and your gorgeous son. My gut feeling is that it is coming from school. You might want to make an appointment with his teacher if it continues in the new school year. If u are a religious family, could it come from the concept of “sin” that he hears about at church or at a Christian school? Maybe during the school holidays, you could take him on a few special outings just you and him to reassure him how special he is. I wish you every and your family all the best. If it gets very serious, u may have to consider talking to professionals.
Published 23rd October 2019