Hi!
No, you didn't need to go through anything so painful. Looking for reasons and explanations can be counter-productive tho, sometimes there is no other reason but that the people we trusted and needed don't possess a moral compass and if we are in their way, they WILL run us over without a seconds thought. It's a shock to the system and it is the root of C-PTSD, that incredulity and betrayal.
Recovery is all about repetitive positive messages and the employment of as much logic as you can at the story til it settles down. The brain is a creature of habit and it wants to return to patterns it knows, so keep reminding yourself of the basics again and again until the balance shifts: it was not your fault, it was wrong and you deserve better.