He sounds like a narcissist. They see people as a source of gaining their narcissistic supply. He will not get tired of boasting if he truly has narcissistic personality disorder, it sounds like he does. Narcissists see people as objects, they have a complete lack of empathy. There’s a lot of good info about narcissism on the web created by this guy Sam Vaknin, he’s a narcissist himself. His advice in a nutshell is: stay away, cut all contact. You can not change a narcissist, even a psychologist can’t usually. Most psychopaths have narcissistic traits and many narcissists are also sadists. She’s really playing with fire I think.