Sarah's lover is the person for whom Sarah Wagner left her former husband, Jack. He is first mentioned when Sarah tells Jack she is leaving him and says, "I've been seeing someone -- someone else." ("The Hunting Party") During the divorce, Jack becomes obsessed with learning "the name of the man that is with my wife." ("A Tale of Two Cities")

The relationship between Sarah and her lover presumably resulted in a pregnancy. ("Through the Looking Glass")

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