although I agree with having certain boundaries going forward (rules) I wouldn't set my mind to strictly on them nor would I really go into it thinking about it much. If you want to have a friendship with someone just do so and keep those rules on your back burners. Overly worrying about the limitations and rules is just going to hinder the relationship. If you're that worried aobut rules going forward (not saying you are) then it's probably not a friendship that's even worth pursuing.

Honestly I just think you should take a step back and consider that. A friendship should not be based on strict expectations from the start. Just enjoy a friend and your relationship or walk away. Friendships are not supposed to be so strained and rule-laden. They should be more organic and based on Positivity, not expectations or waiting 'until" a rule is broken. One cannot work that way and truly have an enjoyable relationship.