Boundaries are learned through original attachment relationships with our caregivers.
Attachment Trauma
Humans need love and connection. Attachment theory explains how humans learn about relationships, trust, safety, and who they are/are not. This is done through many experiences with our caregivers, moments of connection and disconnection, and opportunities to be soothed and guided. When parents respond appropriately, such as being attuned and aware of their child’s needs, children develop a sense of safety. When parents allow children to explore and have their own feelings/preferences, they learn that they have their own self, outside of their parents, and are capable and worthy. Healthy attachment assists in development of the child’s brain, particularly the prefrontal cortex that’s responsible for emotion regulation. Parents can’t be perfect, no one is, but they can aim for consistency, increased awareness and attunement. In healthy attachment, the caregiver sends the message that even when things are difficult and I am upset, I still love you and I am present. So the temporary disconnection still creates a connection.