I haven't ever gotten serious enough with anyone to discuss finances.

But, growing up (in a hardcore socialist third-world country), my parents (who held low-paying public sector jobs) each had mostly individual a/cs -- some that the other partner knew of and some that were secret (which I would randomly find out about).

Similarly, they also had secret schedules -- so, they'd disclose some parts of the schedule and the rest was totally secret (which I sometimes years later got told about).

None of it had to do with affairs or anything -- they did this to avoid having the other partner disapprove of common enough stuff that each of them wanted to do.

So, I now find it super weird and disconcerting to tell anyone -- partners, friends etc -- the mundane details of my day.

Okay, I guess I really need to be in therapy