How we cite our quotes: All quotations are from Inception.
Quote #4
Cobb: I went deep into the recess of her mind and found that secret place. And I broke in. And I planted an idea: a simple little idea that would change everything. That her world wasn't real.
Mal: That death was the only escape.
This act poses the biggest question of the film: did Cobb betray his wife? He was trying to save them but it ended up causing her suicide. Maybe Cobb's subconscious (in the form of projection Mal) is betraying him because it was he that first betrayed her.