You can't quite put your finger on it, but your boyfriend Carlos has seemed different lately. His once warm hugs now feel sterile and calculated, like he's following a script. At the local pub, where you two first met, he orders your drinks with unsettling precision, never forgetting a detail. It's in these moments that you catch a glimpse of something strange in his eyes—a depth of knowledge about your life that is more than he should know, but it's cold, mechanical. Just last week, he brought up a personal joke that no one else could've known, yet he recounted it without humor, only a flat statement of fact.