My guy friend was always negative, and always saying the world sucks and that no one likes them, I tried to help and make him happy, it never worked. He wanted to be "emo" and started only eating 600 calories a day and now he always feels sick and can't eat at all. But I couldn't stand by and watch anymore so i gave up on him. However now he is saying that he would be better if he were dead,and my other friend is telling me it's because he loves me. But i can't bring myself to talk to them because i don't love him back, and i'm scared he will kill himself if i tell him. I really don't know what to do because if i say nothing he may just kill himself anyway.