Even if you see him, don’t meet his gaze.
Eye contact is what will make you feel vulnerable.
I have seen my ex around, and what helps us pretending to him- and to myself- that he isn’t there. It really helps.
I hope you do t be too triggered if you see him. If you start to feel upset, remind yourself that these abusers aren’t powerful figures as they would have us believe. They aren’t real men at all- they are merely cowards!