Another thing to consider is how would are friends and family think of the situatio?. What if you were seen as the duplicate and that means your familiy and friends might no longer see you as you but the other you as the real you? Jason
I'm almost certain there would be immediate hostility between us. I believe myself to be the finest single human specimen ever to grace existence. Any copy of me would most likely believe the same thing about himself. But it can be true for only one. So, a recipe for disaster.
I've sometimes thought about the "multi-verse" concept... where there are different versions of us in different realms... but I think it's a load of nonsense. The main problem with any such idea, is that any variation causes tremendous deviation over time. Thus, it's highly likely in any other "universe", we don't even exist because the special path that it took to make us was altered. This is why the "Mirror Universe" is complete and utter nonsense. They all seem to take some peculiar stance of a more recent branch off the "parent" universe, and that somehow people still met around the same time and procreated to produce the same children. But on a similar tangent, one could think more about Time Travel, and that if you could go back in time and influence yourself to make different choices, would your life turn out better? Like preventing a parent from suffering an early death... or helping you to avoid a tragic accident where you're forever scarred/damaged from it. Maybe get a vaccine in time to prevent terrible internal scarring. Or stop oneself from breaking off a relationship that might have worked out for the better if it kept going. OTOH, if there was some opportunity to meet a "better" version of myself from a different path of choices/possibilities, I think I'd get along. I'd want to learn from that better self!
Perhaps if you explained the benefits two of you could provide....and technically, it isn't cheating.
It would only be fair if there were two of me there would be two of everyone else, so there would be plenty to go around. The two of me would not be too happy with each other because we like to be loners sometimes.
I'm accustomed to living alone, so I wouldn't get along well with anyone I had to share the same living space with -- let alone a duplicate of myself. Hell, I can barely tolerate living with me! Reminds me of the classic Groucho Marx quote: "I don't want to belong to any club that will accept me as a member."
My books would get sorted twice as fast, since I wouldn't need to explain the difference between authors and editors, anthologies and novels, series and standalones, how the same author can have different publishers (in other words, all the yellow-spined DAW books do NOT go together on the shelf!), or the difference between fiction and non-fiction (yeah, I actually had to explain that to two college graduates who were "helping" me organize my first apartment). My cat would be ecstatic because she'd have double the attention and two people to see to her every need. But my double had better know something about computers.