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It's no secret that '80s stars from the Brat Pack and beyond were constantly entangled in some form of complex love story. Melissa Gilbert and Rob Lowe's reads like the plot of a soap opera. The "Little House on the Prairie" star and "The Outsiders" actor had a whirlwind romance from 1981 to 1987, which was characterized more by their tendency to be unfaithful than their actual love for each other. According to Gilbert, Lowe cheated first. She described how she caught him snuggling up to his "Hotel New Hampshire" co-star, Nastassja Kinski, in her 2010 autobiography, "Prairie Tale." After a hotel operator let it slip to Gilbert that Lowe was staying in Kinski's room, she flew to Montreal — where they were filming — to tell him o

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