Okay, this is straight up the plot from an episode of Buffy the Vampire Slayer, where she meets a “soft Boi” who preys on college freshmen, and that’s his schtick. He’s warm and sensitive, reads poetry, and psychology, says all the right things in the correct tone of voice, and she eventually sleeps with him, only for him to ghost her afterward. Later, when she encounters him again she hears him giving that exact same spiel he gave to her, to another pretty, young, freshman. When she confronts him about his behavior he says they had a nice time, claims there were no obligations between them, lets just be friends, blah, blah, blah- you know the drill.
This episode aired in the early 2000s, but I’m pretty sure it’s a tactic that’s been around forever. The whole “I’m not like other guys”, “pikmee” tactic that guys like that have been using to get around women’s boundaries that was chronicled in the novel Les Liaisons Dangereuses by de Laclos in the late 1700s.