Reprimidos (2004)

Mario and his girlfriend Soledad have rented a house for two weeks for a quiet holiday on a virtually deserted beach. To their horror, Félix, Soledad's ex-boyfriend arrives the same day with his newest flame Judith. Felix and Soledad have had a strong relationship in the past. That immediately arouses suspicion and jealousy with Mario. He finds Félix and his girlfriend just an ordinary couple. On the other hand, Félix thinks Mario is a stiff nagging stocking that does not suit Soledad at all.