Have they given you indications in things they've said that they may report or squeal on you to someone? Did you just tell them you were depressed, or did you tell them something more, like you were thinking about ending your life? Are your thoughts actually based upon something in reality, something you know about your friend and what they might actually do, to thwart you, if you should attempt to ctb? The next time you talk to your friend maybe do a good acting job (assuming you are still depressed and maybe still suicidal), and tell them how much better you are feeling, and show it, too, and see what they say and how they react. If they say something like how happy they are that you are feeling better, then maybe you can put your dread feelings to rest, knowing that you convinced them that you are doing better.