I’m not a clinical psychologist either but work in related area. If a narcissist sociopath type, which I suspect, then the other is always merely an extension of the self and so the feelings can be profound in narcissist’s mind but bear no relationship to the actual person of the other in reality. Once the other stops worshiping or disagrees in any way then the narcissist sees that as a catastrophic rejection with no regard or even connection with what other person might be feeling. It’s all about the internal ‘hole in the soul’ really and the need for attention- whether positive or negative. In CB case I think it’s about power and control and an acting out of sorts where kids are concerned - like toys. From what I’ve read though his sexual preference seems to be older women (mother complex and the childhood wound?). I think this piece is a good overview
Beware the Narcissistic Sociopath | HealthyPlace
It would be v interesting to know though date of first surrender by birth mother, date of adoption, date of father car crash, date of handing back to care by adoptive mother. See if any of these are may / early may in addition to the gf we know he stalked.