Why, Michael, why?
I have no clue why people are raving about this movie. Michael is a great actor in everything he does, but his character had about as much charisma as a wet rag. Imogen was okay, but her character's appeal was non-existent as well. Stilted dialogue and nothing to make the characters likable or even explain why they supposedly love each other. Shannon's emotional range was flat; like he was on Prozac.
Nether one of them are interesting or compelling in any way. As a couple, there was less than zero connection or chemistry. They might have been father/daughter for the amount of non-chemistry they had -- which would have been more appropriate considering she looks less than half his age. The story is banal and formulaic.
The description given is pretentious and off-base. It's not a 'psychosexual thriller" at all. There's no sexual tension to be found, and there was no mystery/thrill involved. Just some boring older man being jealous of his younger girlfriend. Redemption? Did we even see the same movie?
This was such an awkward, uncomfortable, unpleasant movie. I wish I'd never watched it.