The following scenario is based on an episode of The Outer Limits, titled "Replica." In this episode, a romantic couple, which consists of two scientists, develop technology which enables the cloning of Human beings. While testing the technology on the wife, which requires that someone's brain physiology be mapped, the wife lapsed into a coma. During the coma, which the husband felt the wife would never awake from, the Husband decided to clone the wife using her brain map that was created during the test.
He falls in love with the clone, which has all of the original wife's memories and personality traits (i.e. it is her in every sense). Do you consider this to be cheating? Keep in mind that the original wife eventually awakes from the coma and is upset to discover that her husband has fallen in love with her clone.