The risk of emotional damage due to souring of a relationship, where relationship refers to any connection or association, including but not limited to: platonic friendship, intimate romantic interaction, business dealing, etc.
Example:
The decision to get married.
Downside Scenario:
The marriage collapses due to suspicions of infidelity, leading to great emotional anguish, feelings of inadequacy, and lingering resentment.
Upside Scenario:
The couple lives happily ever after.