Barbara was driven crazy by a pervert killer. Her spirit has gone wrong and she has completely turned black. Barbara's private life is a mess, and there are many things that have been kept from Gordon. Barbara flinched when Gordon needed her care most.

Barbara chose to escape and left Gordon. Barbara degenerated and became the same as before, taking drugs and drinking.

Barbara's blackening process

Barbara has a saying that I think is particularly good: "Let me share the other half for you".

Gordon didn't tell Barbara at first because he didn't want her to get involved in the maze of darkness and crime, and also to protect Barbara.

Then penguins appeared, and the story was exposed. When Barbara returned home, she was threatened to experience the dark corners of Gotham. Then she became mentally unstable, afraid and insecure. To put it bluntly, she is not strong enough to share Gordon's other half.

Gordon was too busy investigating the case to notice that Barbara was very wrong. Then Barbara ran away and slept with that woman named "Green" Gordon, and it was dark.