Cobb: I can't stay with her anymore because she doesn't exist.
Mal: I'm the only thing you do believe in anymore.
Cobb: I wish. I wish more than anything. But I can't imagine you with all your complexity, all you perfection, all your imperfection. Look at you. You are just a shade of my real wife. You're the best I can do; but I'm sorry, you are just not good enough.