In real life...
when he drags her out of the house and throws her outside, she could have just called the cops and reported him for domestic abuse. She had a witness (Orlando) to back up her story as well. He would have been arrested and there is no way in hell, prenup or no prenup, that he could just throw her outside after 18 years with no money or anything and move his new girlfriend in. It just wouldn't happen. If she had him arrested that first night, she could take him to the cleaners because of all the years of abuse she endured. She could say that because he was controlling and abusive he forced her to sign a ridiculous prenup that no woman in her right mind would sign. Because she signed under duress, it could be voided. I think overall this is not a bad film, but I have a huge problem with the unrealistic premise. No one can actually do that to a spouse of 18 years without consequences. She'd have options in real life. Charles may have been a lawyer, but there were other lawyers out there who would have been happy to take him on.
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