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According to Jim Season 7 Episode 15

Dana puts Andy under hypnosis to learn why all of his relationships don’t last longer than six weeks. Upon learning that it’s due to Andy’s low self-esteem, Dana decides to boost up Andy’s confidence, but she ends up making things worse when Andy starts flirting with other women while on a date with Emily.

Episode Title: The Six-Week Curse

Air Date: 2008-05-13