Torment (1994) on Netflix

Plot summary

Paul Prieur works hard to keep the Hotel Du Lac running, and the job leaves him irritable. He is married to Nelly, and the couple have a son. Nelly is warm with the people who stay at the hotel, and Paul, unsure of himself, wonders why a woman like her is with him. Voices begin speaking inside his head, and his unease turns into suspicion of his wife. When Nelly spends time with Martineau, a man staying at the hotel, Paul trails the two of them. He convinces himself that she has been unfaithful, and from then on he sees every man who checks in as a danger to his marriage.