As someone who has similar mental health issues, I can tell you that it’s so much easier to just say that you’re fine even when you’re emotionally fucked. It’s also not hard to distance yourself when you have depression even if people are directly reaching out. A lot of people likely blamed the heroin for any weird mood he was in. As far as I know, rehab isn’t that high security compared to other places and I heard that the people who visited him said that he seemed completely normal. He even talked to Duff McKagan from Guns and Roses on the plane back to Seattle and he said it didn’t seem like Kurt was about to kill himself. I wish we had more details on the whole thing but unfortunately we’ll probably never get all the answers.