the wife's cheating spirit, sawamura reiko.

It seems that there used to be a night with the husband about three times a week, but from some point onwards, the number of times decreases. When he began to suspect that the reason for this was an affair, there were events in which his suspicions turned into convictions. I happened to have an opportunity to drive my husband's car, and when I looked at the passenger seat, there was clearly something that seemed intentionally left behind by his cheating partner, such as a hair or accessories that were not mine. What was Mr. Sawamura's action that was quite shocked by the reality?