When a person is traumatized and develops PTSD it can be very hard to have a new relationship or have a healthy relationship if already in one. A lot depends on the kind of trauma an individual experienced and their personal history. Also, a lot depends on how well an individual was validated and supported with whatever traumatized them too. It is important that an individual spend time with the right help to work on their regaining their sense of self trust again as often one of the deep roots of the injury is self disappointment that one did not have a way to prevent the trauma from taking place to begin with.

It is understandable that you would use the word "control" too because if someone is traumatized by another person, or several people in some way, the realization of how little control one has over others has become very personal, enough where a person suffered a major loss or a personal sense of "boundaries" has been traumatically violated.

Each individual will need to spend time regaining their own unique sense of loss, and often the individual has to learn how whatever they lost has affected them as often with PTSD that loss tends to run deeper than an individual understands on a conscious level.
Patience with self is very important when it comes to slowly healing.