Honestly, I would understand, I had a friend commit suicide some time ago and even though we hadn't been in touch for a while as he had been living abroad for some years it was still miserable. I can't imagine what it would have been like with someone I saw or talked to every day. Losing a friend is horrible and it's in their own self interest to not have that happen to them just as it is in yours to end your suffering.
Basically, don't tell anyone to stay on the safe side. Go to a confessional if you need to get it off your chest that bad (I'm serious, I've considered doing it myself and I don't even believe in god)