This remake might be closer to the original storyline Glenn Close has talked about. She said her character was supposed to be an obsessed woman who’s a danger to herself. Originally, she was supposed to kill herself and frame him. When she was called back to redo the ending, she argued against it, but obviously she went along with the redo.
IMHO, the movie ending was perfect because the one solid, good person (the devoted wife) saves the day - after her sneaky husband put their family in danger by fooling around with a woman who turned out to be seriously disturbed.
Adding to my post above...
Here’s the original ending Glenn Close talked about:
https://www.youtube.com/watch?v=GY_NQK7rJrY
It’s not bad, but not as dramatic.
I'm glad they didn't do the original storyline. It would have been a ripoff of the film "Leave Her to Heaven." In that movie, it's the wife who is cray-cray and ends up taking arsenic after writing to the man she turned down (Vincent Price, who now just happens to be the DA) that she is terrified her husband is going to poison her so he can marry someone else.