I think you were right the first time... Fear not guilt. You might feel guilty if you ended it poorly and they weren't toxic. If they are toxic to you there is no reason to feel bad for ending it. If they think they need to revenge something they would seek you out. Your best bet if your see them in public is to turn and walk. If they get close enough to say something don't engage and tell them to walk away. Repeat if necessary but don't engage. Unless you frequent the same kinds of shady places a public place is a good deterrent from attacking somebody. I don't know the story but my experience is when things cool down over a done relationship they don't have an interest in starting something.

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