If you found out that you had a fatal disease, would you tell your loved ones?

I know some people don’t like to tell because they think it will make their friends/relatives act differently in front of them. And some tell for obvious reasons (such as wanting to have the chance to say goodbye). I have always wondered which one I would choose if i was ever in the situation. What would you do and WHY?
Addition – I know i would WANT my friends/relatives to tell me if it was them, but is this really one of those things where you should put yourself in the audience’s shoes? (as opposed to the victim)