You should encourage someone who is suicidal to seek help.
David's friend confides in him that he's been thinking about killing himself.
David wants to respond to his friend.
David gives his friend advice, and encourages him to see a therapist.
David tells his friend to keep it a secret, and stop being such a baby.
David's friend feels less alone, and tries to find professional help.
David's friend feel even worse than before, and shuts down even more.