Freud used the word "id", the Latin form of "it" to refer to the impulses, desires and emotions that the conscious mind is not aware of but which largely influence us.
As human beings we are made up of various aspects of identity which include things like race, ethnicity, class, sexual orientation, sexual identity, gender, gender identity, abilities and age.
Inauthenticity is the opposite side of authenticity, and it is authentic to be inauthentic at times because of the pressure of our own facticity and of The "They".
Infidelity takes many forms, from actual sexual cheating to spending an unusual amount of time with a person not in the actual relationship(and usually of the same sex s the partner feeling that infidelity is occurring, to a general feeling of being neglected, to pornography and to rating as ' second-class' compared to others outside the main relationship.
There are often feelings of betrayal and abandonment, of unimportance and neglect, confusion, suspicion, distrust and despair.
Inspired by Transactional Analysis as first developed by Eric Berne, built upon in the recovery movement in the 1980s by John Bradshaw and others and further developed by Sol and Sidra Stone, Dr. Margaret Paul, John Rowan, etc., the "Inner Child / Inner Adult / Subpersonalities' approach deals with the many voices within our Self.
Interpretation is what the therapist does by offering a alternative and developmentally creative version of material offered by the client. Good interpretation spurs positive growth.