I Had An Affair That Broke Up. Now I Feel Like Hurting Him.

I was in an affair with a man. We are not seeing each other anymore. But it is not always possible to avoid each other as we drive past in town.

I think he still feel something for me but he avoids me. I want to hurt him like he hurt me and think about sending him an sms to tell him I'm over him and that I wont border him anymore, or should I just ignore him and make if I did not see him passing me by.