Agreed, and maybe just print this thread and show it to him to share exactly what you have shared here. It is not that you have any kind of plan but that you sometimes find the idea rolling around in your head and you are even investigating or studying it a bit to learn more about it while still quite undecided in relation to it. If he suggests suicide is a bad idea, let him know that is not what you are asking about. You are asking for some help while in search of some relief for the emotions that are somehow driving the intellect to ever even possibly consider it.