How can I get along with a supervisor that I secretly hate?

I recently found out that my supervisor is cheating on his wife since he overshares and brags about his longterm affair with his coworker to everyone in the office. It makes me sick to my stomach and I have a feeling that he already picked up on the fact that I dislike him.

Do you have any tips on how to get along with supervisors, bosses and coworkers you depend on but can't stand at all?

How can I get along with a supervisor that I secretly hate?
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