I would say that your brother has a serious character flaw of his own; I don't know the relationship you two had, but apparently there were issues between you.

All in all, I think it is better to disclose suicide ideation as you dd, even though you may think it was not helpful. You are still alive; things can change - go on the best you can - almost no one has it easy. Your own pain is unique to you, and I can understand that. Try to alter your thoughts; they are the key to how you feel, the key to your emotions.
All the best!