I also really like the idea of having some distance from one's partner, living space-wise. I have heard of marriages breaking up once moving in together, then getting back together and making it work once they live in separate places.

I wonder if the reason you feel guilty about not wanting kids and wanting to be the fun aunt, is bc your parents want something different than that for you. You are right though, you need to live your own life and you truly don't owe them anything including (especially! it's your body and life) grandkids.

Being the fun Aunt sounds great.