My friend has seemed really depressed lately for about 4 days now and, today on the bus home i noticed cuts all the way up his arms. Im pretty positive its SI. His friend hasnt been very supportive of him and im really worried. I asked him what was wrong, and he said nothing, then i told him that if he ever needed to talk that i was here. He said that nothing was wrong and stopped texting me. I see him everyday at school but i dont know what to do. Any advise'