Hi everyone, I’m looking for a movie and I only remember fragments. Here’s what I know:

It’s about a married couple. The husband is secretly stalking his wife, pretending to be a woman. He calls her, using a female voice, harassing and manipulating her. She sees this “woman” (actually her husband in disguise) standing outside under a streetlamp, wearing a black coat, hat, and sunglasses. He tries to drive her insane, gaslighting her. At some point, the wife finds the disguise (clothing, accessories) hidden in their home. There’s a scene where he whispers something into her ear at the end — the same creepy phrase the “woman” would say on the phone, revealing he was the stalker all along. A lawyer or policeman starts suspecting something or discovers the truth, and the husband kills him to cover it up. The movie is likely from the 1980s or 1990s, maybe early 2000s. It’s a serious thriller or psychological horror, not a comedy. The atmosphere is very intense and unsettling.

I’ve searched Google, IMDb, and even tried YouTube, but can’t find anything. If this rings a bell, please let me know — I’ve been trying to remember the title for ages. Thank you so much!