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There was a Jill Gregory book, a sequel to another where the hero blames his wife for the miscarriage she had and goes out to the saloon. I think he even went with one of the prostitutes to her room, but ends up not going through with it. The wife is distraught and runs away, gets kidnapped and is missing for years. He does search for her for all those years, but that was pretty bad for a betrayal.