Bitching, although not an advisable practice, can be a exercise in trust.
If two people conduct a ‘bitching’ session and the discussion remains a secret between the two then both parties have increased trust in each other.
Whether as, if one person confides in another and the confidant leaks harmful quotes then the complainer has lost all trust in their confidant and their relationship will suffer.
In an ideal world you shouldn’t be bitching but I have noticed that it can be a trust exercise between two people.
Thomas Duggan 