The "sweetheart swindle" is a documented con pattern: build a romantic relationship with a target — often someone lonely or isolated — specifically in order to gain access to their money, using genuine-seeming affection as the delivery mechanism for financial exploitation rather than as an end in itself. What makes this tactic durable across decades and countless victims is that each new target experiences the romance as unique and real, with no way to know the same script has already been run on others.
Robert Hare's research frames this as a clear demonstration of the core psychopathic deficit: the capacity to simulate the outward signs of love — attentiveness, promises, apparent vulnerability — completely detached from any actual emotional investment in the other person's wellbeing. The performance and the feeling are not connected at all, which is exactly what allows the con to be repeated indefinitely without any cost to the person running it.
Hare describes a con man who built an entire career on courting lonely women, proposing marriage, and then systematically emptying their bank accounts before vanishing — each victim believing she was uniquely loved, with no knowledge that the same script had already run on many women before her. A separate case in the book describes a professional woman traveling alone in Europe who was approached at the Lisbon airport by a man posing as an undercover agent needing her help; he traveled with her for weeks, running up enormous credit card charges before disappearing once she grew suspicious. She later reflected that his comforting, understanding manner made an increasingly implausible story feel believable the whole time.