Of course she should tell him! She may be infectious. He may have been immunized.

BTW - I don't know when she was diagnosed, but it often clears itself spontaneously. She should speak to her physician. Also, she should definitely avoid alcohol.

EDIT - I don't think you are being fair to a guy who doesn't choose to accept this. Hepatitis can be a very serious disease. People have a right to not want to be exposed.

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