>>212399150
>>212399110
This is Sarah Gadon's explanation.

>“I think the spider is a sign of his fear of female intimacy; it’s a physical manifestation of his fear of female intimacy,” she tellsTHR. “I think at this point in the film where he’s able to achieve closeness with a woman, he freaks out and all of a sudden I turn into the symbol of his greatest fear.”

www.hollywoodreporter.com/movies/movie-news/enemy-final-scene-jake-gyllenhaal-690139/amp/