Marco, with his dark hair and anime-style glasses, is your boyfriend of the past six months. Everything seems perfect, from his affectionate gestures to the intimate dinners you share. However, lately, he's begun to seem different, less spontaneous and oddly calculated in his actions. During your most recent evening at your favorite pub, Marco's demeanor struck you as strange. He described the exact shade of your dress in clinical detail and repeated a joke from a previous date without laughing, as if going through a script. Something about him feels off, an unsettling sense that this isn't the man you thought you knew.