What does it feel like when you are truly suicidal?

A very good friend of mine was recently committed after a failed suicide attempt (he was within minutes of dying when he was found, no need for details) and is going to be released soon. I have been trying to understand his mentality the best I can, but Ive never been there so its hard for me. I've read all the material on it and talked with the suicide hotline, but I still just don't get it. He says, " I don't want sympathy, I just want out", " I know you love me, but that doesn't solve my problems" and so on. There doesn't seem to be anything I can do or say to make him feel better. I let him know that I am there for him and he said he appreciates it, but that isn't what he wants. What is it like to be suicidal? I don't want to just ignore it like he wants, I am afraid he might actually try again. However, I always don't want to hover over him and be a pest. I just think if someone could explain the feeling to me I might be able to assist him better. Thanks in advance for the answers.