I have had relationships with 2 women who show lots of narcissistic behaviours and they both moved on super quick.
The first drove away from my house bawling her head off when she realised I wasn’t going to change my mind and was on a date 2 days later with someone she went into a relationship with. Within a year of me breaking her heart because I was ‘her world’ she got married, had been engaged to someone else, hoovered her ex fiancé and talked marriage with at least one other woman. Those are only the ones I was aware of.
The other one was quite scary and started to show real signs of abusive behaviour so I literally ran out of her house about an hour after she was telling me that she wanted me to be her wife and saying that she wanted us to get a place together. Another full on relationship within 3 weeks and I have no doubt that the searching for the next victim either started the day I left or even a few weeks before when I started to notice the controlling behaviour and stood up for myself.
I later realised that both of them were engaged only weeks before they met me