The Road to Singapore (1931)

In this drama, a doctor and his wife are stationed in Singapore where the lonely wife, tired of constantly trying to get his attention, begins soliciting another man into having an affair with her. The man is reticent though. When the doctor finds out and assumes they are involved, the woman becomes so angry that she threatens to take the next boat out and leave them both. Instead it is the would-be lover who ignores the jealous doctor's loaded gun and calmly boards the boat.