What boundaries do you take for granted when you get in relationships? Have you had to come back set them after an unexpected breach?

I am kinda fascinated for all the common things everyone does in early relationships without taking time to discuss them.

In the timeline of a seduction project you often have stuff like first date, first kiss, first sex, and then you navigate social/public behaviours like: in front of whom do you show displays of affection, who meets your partner, do you share instants of your couple on social media, etc... Then only after this initial mess, someone usually the woman will go "what are we", and if all goes well you then have the usual wedding kids dogs picket fence scheme, "like in movies". But still there, you never 100% know your spouse and they might surprise you in a number of ways.

All of it done effortlessly until you realize your partner has done something you don't like and didn't expect at all... I'd be happy hearing stories on this topic. Which of your boundaries were breached before you even got a chance to formalize them?

I am starting: with my ex we started seeing each other in hiding, no one could know... I never could tell her but it kind of irked me how long this period's lasted, even though I found it logical at the start.