Is he like this after lost his job or some other incident has happened in his life. Maybe lost interest due to hopelessness. He need to get occupied, to come out of this behavior. Also,  of possible,  do consult a psychologist in your city.

I will appreciate your concern to him, Yes I can understand the feeling of negativity in unemployed people. at present he need to vent up his emotions, has to build confidence of his skills and knowledge. Before reaching worse please take him for the psychologist/ psychiatrist for better assessment. take care

Stressful situations like job loss or unemployment can cause depressed mood. If suicidal thoughts are present, then he needs to consult a psychiatrist who will provide relevant treatment after asssessment .