Why didnt Borden tell his wife? (major spoiler)
!!!SPOILER!!!
I dont get it, it seemed that the pain and emotional suffering Borden and his wife had to go through because of the constant character switching was unnecessary. Why couldnt Borden just tell his wife what was actually going on. Borden should have seen the suicide (or at least her leaving him) coming. I am sure she would have been able to keep the secret because his trick was their main source of income.
I actually consider this a plot hole, it really doesnt matter how obssesed Borden was with the total commitment to his trick, he should have realized that just telling his wife the truth would be a lot safer in keeping his trick a secret (his wife could just as easily have figured out the ruse on her own, and then used it to Blackmail Borden because of his selfish behaviour) and much less emotionally stressful for Borden.