Are these various scenarios crossing a boundary?

[Oreoorea]

Would like your honest opinions. partner of 1 year, don’t live together.
wokld it bother you if they-

1. went away on a work trip/retreat type event and used a naked sauna. Being naked wasn’t compulsory but ‘everyone else was doing it’
2. had a close friend who they confide in daily, text, meet up in a group scenario who turns out they met on a dating app but decided just to be friends.
3. has disclosed that they have regularly kissed their friend in the past as a ‘laugh’ before we were together and expect us to double date now with said friend and their wife.

disclaimer- I purposely did not include this at the start but we are a same sex couple so all parties in these scenarios are other lesbian women. Maybe this changes your views? Interested to hear

Boundaries are personal. It doesn’t matter what I think, it’s what you think. That’s the whole point of boundaries.

I don't understand how any of them cross a boundary, as boundaries are guidelines for oneself, not something they can impose on others.

The third point is the only one the op can have any sort of boundary about.