Although my friend has contracted a disease that has no cure, I would feel comfortable in his presence and help him research information about the disease and treatment options. Also, I would worry about my friend's mental health and ask if he is doing well and think he needs psychological counseling to learn how to deal with the situation.
Finally, I would tell my friend that today people with HIV can lead a normal, quality life if they have the necessary medical care. Also, I would ask if he wants my company while visiting the doctor and would tell her that any need he could call me.