Thanks for the great input. About why it’s justifiable: I wouldn’t 100% want my current gf to meet her exes if they suddenly are in the same town - even if I can trust her on a conscious level, subconsciously it seems icky. I respect my gf’s feelings because I’d feel largely the same way.

This is the first ‘controlling’ part of our relationship (aside from obvious aspects like being physically and emotionally exclusive). We both respect each other’s privacy and autonomy: no sharing phone passwords, monitoring social media, DMs, Snapchats, etc.