[Quoting Morris Schæffer (view post)Why exactly should Nick be []forced to live out his days with Amy by the end? Yes, because the public would eat him alive, but if the man is unhappy, and now knowing he's living with a throat-slitting, well, cunt, surely he's free to do as he pleases. The movie makes it look like amy's just checkmated Nick. One thing though, the baby, was it his?if it's Desi's baby, then there's nothing in that regard holding Nick back from leaving Amy either.]That's his child. That's why he feels trapped. He can't imagine leaving that child in the care of Amy without him to look over him/her. It's definitely his. This is addressed by her letting him know that she didn't throw away his frozen sperm like she pretended to do. She kept it and used it when it suited her.
[Was it always her intention to []kill Desi and return or did she see that her situation was hopeless and that the only way to screw Nick was to actually return as the victim of Desi? Even though initially she thought that vanishing into thin air was the ideal way to screw her husband.]She definitely intended to kill Desi and return to Nick. She recognized that with Desi, she was trapped like a rat in a cage. She was powerless, something she simply can't live with. Nick gave her enough of a sign through his interview, by wearing the watch and groveling to her when he knew she had set him up at that point that she recognized that going home was her best option. She knew she could control Nick at home.