The first time I quit drinking when I was a lot younger, the same thing happened to me. I found out who my real friends were.
A close friend came to visit me in treatment when she was high, and when I asked her not to visit me in that condition I never saw her again.
I don't think that asking someone to respect your boundaries by not being around you when they are drinking is unreasonable at all. But if you're asking them to avoid your old bar, that's unreasonable.