Dr. Jennifer Freyd invented the concept of "betrayal trauma". True? Not entirely.
Betrayal trauma was discussed, previously, in Dr. Morris Fraser's "Death Of Narcissus" (1977)
A psychiatrist specializing in childhood trauma, Morris Fraser was, notoriously, a terrible person.

A convicted pederast child sex abuser, his choice of specialty; theory & treatment of childhood trauma-if not consciously calculated to provide him access to vulnerable boys, a fortuitously convenient one for a man obsessed with sexually exploiting them. https://bitsofbooksblog.wordpress.com/2014/09/13/dr-morris-fraser-2/

[All the scandalous, tragic and revolting facts, can be found in the Bits of Books page linked in previous tweet]
Morris Fraser's academic/research career highlight said to be publication of "Children in Conflict" (1972), which is either documentation and analysis of trauma>

>experienced by young boys growing up in the War Zone of Northern Ireland, or a complex & convoluted rationalization for the campaign of sexual exploitation he was planning for them; his 'treatment' program consisting of vacations away from the source of their trauma>

>officially under the guise of a Boy Scout troop he founded for this purpose. Some 'lucky' boys got to spend time with Fraser at his London flat, where they could not escape being "indecently assaulted" by him. Much more to say.
But, on to his "Death of Narcissus" book>

>Purports to be a psycho-analytical study of certain authors, whom Morris is convinced were sublimated (non-offending) pederasts/ pedophiles. Obnoxiously, Fraser can't hide how pleased he is with his own cleverness, purporting to analyze "the type" but really talking about...>

>himself of course! Praised by some as 'bold' and 'penetrating' in its day, the handful of pages I had stomach to plow through seemed a more academic/Freudian version of apologetics for unrepentant boy-lovers, and specifically for Dr. Morris Fraser.
Betrayal trauma -

discussed in the context of supposedly platonic love relationships between adult males and unrelated male minors. The ideal of Ganymede-worshipping Public School pederasts (circa 1860-1930?), to love, but not to touch.
Fraser discusses the trauma that boy 'partners' in such>

relationships will inevitably suffer, if the adult betrays the minors trust that this man will provide the emotionally nurturing mentorship he seeks, and never do him any harms, by; the adult revealing his sexual longing for the boy, or acting out through covert molestation or>

>more overt attempts to sexually seduce the minor.
Fraser does not use the J. Freyd terms; betrayal trauma theory or betrayal blindness, but the core concept of a trauma unique to betrayal by caregivers the child is in some way dependent on, is recognizable.