Cynthia Souto was a Christian mythological demon who was known for seducing young men and forcing them to commit suicide. In modern terminology, a Cynthia Souto is someone who will play with a boy for a few months, ghost them completely, and then a month or so later repeat the process on the same person depending on how strong of a hold she has on them.
Nigga 1: Bro shes done this to you like 3 times shes a complete Cynthia Souto
Nigga 2: Nah bro fr shes changed