You shouldn't lie about being sober.
Tom is proud of his wife, Lisa, because she has stopped drinking and is attending meetings to help her, but Lisa has started to drink again.
Lisa doesn't want Tom to know that she started drinking again.
Lisa comes clean at a meeting and tells her support group that she needs help to stop drinking again, and that she doesn't want it to hurt her marriage.
Lisa keeps attending the meetings, but she drinks both before and after each one of them.
She gets the help that she needs and stops drinking again through her support structure, and Tom continues to be proud of her efforts.
Tom and everyone at the meetings quickly become aware that Lisa is drinking and Lisa feels shame and embarrassment that they found out.