Happened to me a few years ago, started in a new office and one of the guys seemed cool so we talked more frequently. Ended up helping him get the apartment upstairs from me because his lease was expiring and carpooled to work. That’s when the clinginess started, couldn’t go half a day without him always texting or calling over stupid shit and borderline unhinged behaviors. I distanced myself real quick from him. The final straw was when he had asked what “village” my girlfriend was from in Brazil, then doubled down when I called him out for assuming she was from some uncontacted Amazonian tribe. “Well you havent been there yet so you don’t know lol” yeah ok fuck you, dude. Haven’t talked to him since, even though he still lives upstairs.