Three friends - Babs, Els and Marcel - jump out of a plane together. They are regular sky divers and as they approach the ground they activate their parachutes. Els' parachute fails, as does her reserve parachute. She falls the remaining 1000m to her death. Was it a tragic accident or was it murder?

In this episode of Bad People, Dr Julia Shaw and Sofie Hagen debate their differing views on monogamy. They discuss the psychology of jealousy: what makes someone jealous and does it serve any purpose?

This episode contains audio from AP archive.

Warning: This episode includes mention of suicide and some swearing.

CREDITS

Bad People is produced in partnership with The Open University and is a BBC Audio Science Production for BBC