Anyone else sees their partners Ex’s or former FWB everywhere?

My wife ( 30 F ) went to college in my home city where we currently live, pretty well known Uni, pipeline to the community and philanthropic work is pretty strong, my wife dated and became FWB with a man who’s very active in our community and I see him almost every time we attend some kind of community event or something. He always makes sure to stop by and say hi whenever he spots her, the things I know they’ve done, I can’t help but get hard whenever I see them within 3 feet of each other.