It's very common for addicts to resurface, and travel many miles to do so. It's also common for abusers to do this, as they have a compulsion to dominate and a need to pressure a partner or former partner into submission. It's also common, as well, for pathological narcissists--if they haven't found a new partner--to reappear because they have a compulsion to seek attention and they feel dead without it.
I can't advise you on any specific action--other than NC, of course--and though you have not posted that he has ever been threatening in a physical way, still, since you are dealing with someone who is intoxicated, it would be a good idea to keep pepper spray in your purse. You can pick one up at any large sporting goods store. A small sprayer for your keychain is about $10.