I know not everything has a meaning and some things just are. But i haven't seen this behaviour before or at least to this extent. And i don't know what to make of it.

I was on a date this friday. (Met her at a bar 2 weeks ago, made out with her that night went on a date that saturday, been texting a bit).

It was somewhat late, bar & restaurant, so there was music but we were sitting down and chatting. We both had a couple beers and some food. She was doing the talking while i was listening (barely, some stuff really bored me so i looked away and didn't hear it). At one point, about 1 hour in, i remembered this post about shutting up, letting the conversation go silent and just looking into her eyes with intent. So i started looking at her with intent and she finishes babbling, looks at me , puts out this huge smile and after 2-3 seconds she makes this noticeable prolonged, nod. To which i just kept silent and looked at her, no head movement or anything else. She laughs after that.

The nod seems to be something i come back to whenever i recall on the date.

Could it be related to the fact that she thinks im a narcisist and that my extreme confidence is hiding something. (it's because i joked the whole date about being this almost god-like human, she had huge smiles and seemed to be really into it so i ketp doing it). IOI maybe? I already know shes into me. Was it a, fuck me already behavior?

Any pointers would help for the next time i notice it.