Spoilers alert...
This film had all sorts of promise. And it could have been a better film. But it lacks one solid thing...a point. The fact that abused people carry their trauma all their lives is not new nor is it entertaining. That type of film is best described as trauma porn. Its not pretty and its also not horror.
As to the ending, if the main character is delusional, it's a sad tale.
However, If the film makers intended to sell you on the fact that a baby can live inside a man for 22 years after he eats it, become whole again and then be cut out and taken home by its mother.... then they are delusional amd sad. There are so many things wrong here you need a book to cover them. You will hear that people think its brave. Or a study in trauma and relaps. Or perhaps it's all just a metaphor for whatever.. what it is , is pointless and shocking for shock value. The acting aside, there is nothing here to see. To gain. Nothing of any value. Just something to talk about round the water cooler. And if that's our bench mark for a good film..we have a great deal more to worry about.