What did I miss? Just watched this and felt betrayed!

Rating: 3/10 (24 January 2018)

There must be something that I missed here. This was a very irritating movie to watch. The poor woman got everything done to her that was horrible. And then, at the end, everything just went back to where the movie started, exactly. I suspect they just used the same footage a second time. So what was accomplished? What is this time warp? Is this an endless time loop? Why did the house go back to being pristine (well, sorta) again? Is all of the nastyness about to happen to her again?
This is either way over my head or way below my feet. I got nothing from this except irritation for a wasted 2 hours. I see this kind of film and see people gushing all over it and just think: Either these people are idiots or I am. I am I sure I am not, by actual testing. So what is needed to make some sense of all of this? Where is the ending? It seems to loop back to the beginning so there is no ending. Movies without an ending is like a detective story where the perpetrator is never caught. What's the point???
Huh????