Ugh, possessive exes are the worst—like emotional barnacles that refuse to scrape off. My friend went through this with her ex, who’d text her constantly 'just to check in' (aka monitor her). She finally laid down ironclad boundaries: no replies to non-emergency messages, blocking social media stalking, and only communicating through a parenting app (they had kids). It took months, but he eventually got the hint.
What helped her most was documenting EVERYTHING—screenshots, emails, even voicemails. When he showed up unannounced at her gym (creepy, right?), she had evidence for a restraining order. Also, therapy. So much therapy. Not just for coping, but to untangle why she tolerated it for years. Now she jokes that her ex’s possessiveness was just his way of saying, 'I’m terrible at relationships, please fix me.' Spoiler: she didn’t.