Yes. It's a boundary you don't encounter in English as there's only one way to say "you" but in my language (like many other languages) there are two ways: the polite ''you" and the casual "you".
I used to address her with the polite form and she did the same with me until one day she asked me if we could switch to the casual "you". I said no. It was too weird. I couldn't do it. It was one thing for her to use the casual "you" with me but for me to use it with her was absolutely impossible. It was my boundary.

So I refused altogether. She's never brought it up again and we've sticked to the polite form. Which is better I think.