Most Helpful Guy
I say let it go. People can be inconsiderate sometimes. But I've always felt like morality was a choice and morally policing the decision of others does nothing but frustrate you he knew what he was doing when he was doing it I'll doubt he cares now. If you feel like the girl should know then tell her privately somewhere no need to make a scene and let her decide to deal with it on her own. Don't make both of them suffer in public because that will surely hurt her far more than it hurts him.