the movie "The Flash" had not been released, so I cannot provide specific details about how Batman's retirement is portrayed in that particular film. However, I can speak generally about how Batman's childhood trauma is often depicted in various Batman stories, and how his decision to retire as Batman may be related to that trauma.
Batman's origin story is a pivotal aspect of his character. When he was a young boy named Bruce Wayne, he witnessed the murder of his parents, Thomas and Martha Wayne, in a mugging gone wrong. This traumatic event had a profound impact on him, leaving him with feelings of grief, anger, and a desire for justice. Bruce Wayne, driven by his trauma and a sense of responsibility to prevent similar tragedies from happening to others, later dons the persona of Batman to fight crime in Gotham City.
Throughout Batman's crime-fighting career, he often faces internal conflicts due to his trauma. On one hand, his mission to protect Gotham and seek justice is driven by his childhood trauma. On the other hand, that same trauma can be a burden on him emotionally and psychologically. It can create a fear of losing loved ones, a difficulty in forming close relationships, and sometimes, a desire to protect others from suffering the same fate he did.
In various Batman stories, there have been instances where Batman decides to retire or step away from being Batman temporarily. This decision is usually prompted by factors such as fatigue, overwhelming stress, doubts about his effectiveness, or fear of becoming too consumed by the darkness of his alter ego. At times, he may also come to realize that being Batman has its limitations, and he needs to find other ways to make a positive impact on Gotham and the world.
If "The Flash" movie portrays Batman's retirement in this context, it could be a reflection of how his childhood trauma still influences him as an adult. His decision to step back from being Batman may be driven by a desire to confront and address his past, to heal from his emotional wounds, and to find a balance between seeking justice and finding peace within himself.
Keep in mind that my information might be outdated, and I recommend checking more recent sources for specific details about the portrayal of Batman's retirement in "The Flash" movie.