What is this all about? It seems like every time I start dating a girl, sometimes even from the very first date, they throw in something about how I'm so much better than her ex, or how her ex would do this, that, and the other to her and not treat her right? And how am I supposed to react to these sorts of subtle mentions?

I'm just trying to identify what their motives are when they do this. Are they trying to inflate our egos by telling us how great we are, which thus allows us to feel like King Shit, so we stop fearing that they'll leave us? At which point, they have free passes to do exactly that? Thoughts?