Psychotherapy is a deeper level of therapeutic support. Working with someone in a relationship can often open up how clients react and respond in their other relationships. Thus allowing clients awareness of themselves to grow and develop. We are all on a journey of self discovery, however this journey can remap neurons and transmitters in the brain and rid clients of old patterns of behaviour and expectation.
What is broken in a relationship, either as a child or adult can often be fixed by the experience of a positive other (the therapist) in a new and different relationship.