The Ex (2017)

Ordinary bloke Dave's plans for a weekend working overtime are ruined when his ex-girlfriend Laurie arrives suddenly at his office and announces herself as the new temp. As Laurie's behavior grows ever more inappropriate and bizarre in her attempt to win her ex back, it becomes clear that something very wrong is afoot, and that a disturbing secret lies at the heart of Laurie and Dave's unusual relationship. A delightfully weird horror-comedy about jealousy and obsession.