SPOILERS AHEAD FOR THIS BRILLIANT FILM

Rating: 10/10 (20 March 2018)

If you are looking to shut your brain off and be entertained and led by the nose, skip this film.
If you are looking for a cinematic experience that gives back to you in a profound way like 2001, Solaris, Stalker, The Tree of Life, The Fountain, The Thin Red Line, Under The Skin, Enemy, 8 1/2, La Dolce Vita, Blade Runner (directors cut), Dead Man, Days of Heaven, Upstream Color, Wild Strawberries, or even The Phantom Thread - you will really like this film. It's a one-of-a-kind gem that strikes at the heart of a matter that touches many people on the planet, and is honest about the effects of betrayal within a marriage.
I feel that this movie will polarize many audience members because it is a film that asks you to reflect upon your identity, or at least the identities of the two main characters, Lena and Kane. The film is about trauma within interpersonal relationships, specifically sexual betrayal and everything that goes with that. The story is a giant and beautifully crafted metaphor for how relationships work, how we see ourselves when we are in one, and how the self-destructive tendencies that reside in one of the people in the relationship destroy (or annihilate) the identity of the innocent partner, who experiences the betrayal as a trauma similar to combat PTSD or cancer or addiction or the loss of a child. In a film with a lot of subtext, this is the driving theme. This experience is often overlooked by our western culture because of the stigma of shame that can accompany it. But not in this film.
It makes the point that until we can be vulnerable enough to face our true selves, we won't have the power to change our self-destructive behaviors, because we won't understand ourselves enough to know why the self destructive behavior exists in the first place. It also makes the point that once a trauma has happened in the relationship, the relationship profoundly changes forever, as do the people in it. In the case of Lena and Kane, they decide to try and love each other in the aftermath of this affair, but are both forever changed by the experience.
This film is layered with many amazing psychological metaphors and challenges the audience all the way through, but in an engaging way that never gets boring. It all connects and makes sense. The trick to unraveling this mystery is to see the experience of the main character as a metaphorical self journey to gain empathy for what she has put her husband through.