What do you think happened to Two Face?
Honestly, I think he found out at some point that Bruce Wayne was Batman, and this sent him completely over the edge into madness/death from which he never recovered. To find out the one person he trusted, his best friend, was actually the most "two faced" of all was an irony that would have destroyed him. This is the one revelation I wish they had explored on the show, because there was so much foreshadowing that this would somehow be later be paid off as a resolution of sorts to Dent's story in BTAS, but it never came to be. I don't read read the spin-off comic as I don't consider it canon so I don't know if they made something up there, but I wouldn't take it as fact either way.
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