It is about a young man (late teens/early twenties) who is in some sort of African country and meets an older married couple who are nomads and travel the world. The husband treats her like shit and when they are camping out one night, the wife has an affair with the younger man. The husband agrees to take the younger man back to the airport so he can go home and he suspects the affair and before the young man gets out of the car, reveals the reason why his marriage is on the rocks (don’t want to give it away). Does anyone know the name of this short film?
This has some similarities but is longer than 15 minutes:
http://www.imdb.com/title/tt0077188/
It is called Hitch Hike from 1977.
Unfortunately, the short is rather recent. Thank you though!