Why do you think Castiel didn't get out of Purgatory with Dean? (poll 6597233)

Why do you think Castiel didn't get out of Purgatory with Dean?

He choose to remain behind to continue atoning

Dean made the choice (free of influence) to leave him there

Benny somehow manipulated the situation so that Castiel stayed behind

Someone/something else prevented Castiel from getting out

Other (let us know in the comments)

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