[MaulingMonkey]

Both matter.

It's easy enough to tell someone to never contact you again. But if you see them daily as you prepare to commute because you live next door, a lifetime of social pressure to not be so rude as to ignore people is likely to get them to slip up and at least say "good morning!", even if they want to respect your boundaries (and definitely if they don't, and are looking for an excuse to trample all over them while perhaps pretending otherwise!) If you share a common living space or other "shared business" it's even worse, as there's also the completely understandable pressure, if not outright need, to resolve problems involving that shared business.

Moving is an action that can help disentangle you from shared business - be it common living spaces, shared fences, shared neighborhood issues, etc. - and help dismantle habits that would undermine your boundaries.