The "Flashpoint" timeline is a dark distortion of the original DC Universe:
The search for the is ultimately a search for understanding. This film is an index of pain—a catalog of what happens when heroes break their rules. It forces characters to confront the ugly truth that happiness often requires sacrifice. Index Of Justice League The Flashpoint Paradox
Barry Allen’s final decision is the ultimate reset button. He lets his mother die so that Bruce Wayne can live to become a hero, so that Clark Kent can rise as Superman, so that Diana can know peace. When he returns to the "correct" timeline, he shares a silent nod with Bruce Wayne. Bruce doesn’t know why Barry is crying. He doesn’t know about the letter from his father that now sits in the Batcave. The "Flashpoint" timeline is a dark distortion of
As the war between the Amazons and Atlanteans reaches a breaking point in London, Barry and his ragtag team (Batman, Cyborg, and a freed but traumatized Superman) attempt to stop the fighting. finally reveals himself, explaining that Barry’s own actions caused a "time boom"—a ripple effect that corrupted events both before and after the moment he saved his mother. IV. The Resolution: Running Back Barry Allen’s final decision is the ultimate reset button