"...most people naturally discuss daily and significant experiences with others. Even major traumas such as the death of a friend, a shared natural disaster, or a house fire are usually discussed in detail with close friends.
Less socially acceptable traumas, however, can be far more difficult to confide: marital infidelity, embezzlement, being the perpetrator or victim of rape.
Whereas talking about the trauma with others can strengthen social bonds, provide coping information and emotional support, and hasten an understanding of the event, the inability to talk with others can be unhealthy for a number of reasons..."
Pennebaker, J.W. (1989). Confession, Inhibition and Disease. Advances in Experimental Social Psychology, 22, 211-244.