For those confused about the ending

With the exception of the ending I think everything was real. We can see the impact that David had on Margaret’s life. Due to him completely ruining her trust with men it means that she’s having sex with a married man. That makes him off limits as far as relationships go. It’s also why when Abbie invites him over for an intervention that she’s so pissed. Because it’s just supposed to be about sex and nothing more. The same goes for when he tells her that he loves her. We also see this when David asks Margaret who the father of Abbie is. She says that she just had sex with random men, so she doesn’t know who it is. She did that so that she could have a child and the father wouldn’t be involved in their life so that she wouldn’t have to experience what happened with David and their son again.

David obviously never ate Ben. He killed him and and then buried or put him elsewhere as part of the abuse. In the same way that some people will try to have a baby in order to keep their partner around, he decided to kill the child and convince Margaret that he ate him and that he’s still alive inside. It’s obviously insane, but you have to remember that when Margaret told Gwyn about their relationship that she mentioned that she believed everything he said. So for as unbelievable as that is, she still believed it because of how successful he was at manipulating and grooming her from a relatively young age.

The end I believe is her breaking out of the delusion that she went into after killing David. We already know that Abbie moved out their apartment, so it makes no sense for her to be packing up. And Ben has obviously long been dead. So we get that zoom in on her where everything looks perfect. Except it keeps zooming closer and closer revealing all the flaws on her face. It’s her delusion slowly breaking.

FULL SPOILER-FREE REVIEW @ https://www.msbreviews.com/movie-reviews/resurrection-spoiler-free-review-sundance-2022

"Resurrection is an exceptionally tense, frighteningly realistic psychological thriller, deeply elevated by a masterclass performance from Rebecca Hall. The latter becomes a major contender for awards even beyond the festival, offering an unforgettable, mesmerizing, haunting display of a traumatized mother.

From a hypnotizing, uninterrupted 10-minute monologue to nerve-wracking interactions with an also remarkably creepy Tim Roth, Andrew Semans puts the actress through shocking, disturbing plot points and emotionally devastating character development. The lingering cinematography and powerfully effective sound design exponentially increase the suspense and intensity levels.

A divisive, multiple-interpretation ending may divide some viewers, and a slight loss of momentum during the second act may reduce the climax impact, but these are minor issues in what will end up as one of the very best movies of the year."

Rating: A

These sorts of psychological thrillers are completely my bag, so I think I took this more favourably than the other reviews on this site and around the web. Resurrection tells a story of Maggie, a woman who seems to have her life together before she becomes completely wrought with trauma from a distant past relationship. When the man that instilled this trauma upon her reappears after 22 years, Maggie's safe, stable life is upended as she attempts to deal with the reintroduction of this source of endless pain and trauma.
Resurrection really hammers home the damage that a past trauma can bring to someone, even decades after the fact when they've seemingly processed that portion of their life. New relationships are destroyed before they can even take shape, family bonds are broken due to the strain, and the ability to function "normally" is thrown into disarray. Rebecca Hall really gives her all in this performance and it shouldn't go unnoticed due to the "horror" banner that this film will assuredly fly. There is one monologue that is showstopping, and I imagine will become a new audition piece for many aspiring actors.
While many seem to bemoan the lack of concrete answers, Resurrections dream-like, surrealist portrayal only aids the intricate feeling and emotion that it's trying to evoke and convey. Having no final answer gives us the chance to ponder and muse on what it all means, and has seemingly led me to writing this glowing appraisal.
If you're a fan of the new wave of surreal, psychological horrors with a contemporary twist, you can't go wrong with Resurrection. Prepare for a slow burn and let everything wash over you and I promise the post movie debrief will be worth it as you dissect and ponder everything you've just seen. Very good movie, and one that I'll be thinking about for the rest of the day.