because he remembered what happened at his wedding and then seperated from his pregant wife
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Dr. Manette suffered amnesia after witnessing a traumatic event at his daughter Lucie's wedding, where he recognized Darnay as the man who wronged him in the past. The shock of this realization triggered his repressed memories from his time spent unjustly imprisoned in the Bastille, causing him to relapse into a state of amnesia.