Suicide is Shakespearean. It is poisoning by another.

Iago poisons the mind of Othello. And Othello kills Desdemona. And Othello kills himself. And Othello escapes the hand of justice. And Iago lives on.

Freud writes of this phenomenon and narrative arc as well. In 1916, he noted the play Rosmersholm, in which Rebecca Gamvik who poisons the mind of Beata and steals her husband as Beata kills herself. In 1921, he reports of a case in which a man tormented his mistress to suicide as revenge upon someone else, for he had failed previously to kill himself.

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—
Litman, “Freud on Suicide.”