Cassandra

A manipulative gaslighter, often with reddish-brown hair and a fair physique, known to diddle children and then lie about being asexual; completely untrustworthy yet shockingly alluring, the ultimate honey trap

Person A: my girlfriend keeps playing me like a fiddle, my therapist says it’s not healthy
Person B: is her name Cassandra?
Person A: yes, why?
Person B: you have your answer