As an AI developed by OpenAI, I don't have real-time updates or the ability to make predictions on future events. As of the time of my last training data in October 2021, the fifth season of "The Marvelous Mrs. Maisel" has not been released yet. So, I'm unable to provide information about what happened to Joel in Season 5.

However, I can provide an overview of Joel's character up until Season 4. Joel Maisel, played by actor Michael Zegen, is Midge Maisel's ex-husband.

Throughout the series, we follow Joel as he navigates through his broken marriage, his struggling business and his complex relationship with Midge. While initially portrayed as somewhat of a villain due to ending their marriage, the series also shows his considerable personal growth, ultimately redefining him more as a supporter of Midge's comedy career.

Though they separate, Joel and Midge share two children and continue to maintain a complicated relationship.

They often lean on each other for support and sometimes struggle with lingering feelings. In Season 3, Joel starts a nightclub in Chinatown, transitioning away from his tedious job at Triangle Shirtwaist Factory. He also provides emotional support to Midge, especially after she gets fired from her world tour.

As of Season 4, there's a lot left open for Joel's character in terms of potential development and storylines.

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