This character suffers a mental breakdown as a result of a traumatic event.

Psychological trauma is a type of damage to the psyche that occurs as a result of a traumatic event.

A traumatic event involves a single experience, or an enduring or repeating event or events, that completely overwhelm the individual's ability to cope or integrate the ideas and emotions involved with that experience. The sense of being overwhelmed can be delayed by weeks, years or even decades, as the person struggles to cope with the immediate circumstances. Psychological trauma can lead to serious long-term negative consequences that are often overlooked even by mental health professionals.

Trauma can be caused by a wide variety of events, but there are a few common aspects. There is frequently a violation of the person's familiar ideas about the world and of their human rights, putting the person in a state of extreme confusion and insecurity. This is also seen when people or institutions, depended on for survival, violate or betray or disillusion the person in some unforeseen way.