The only problem I see here with your question is that no one really knows the answer, they can only speculate. I, for instance, think that I'd get along just great with my duplicate, and that we'd work together on getting more stuff done and enjoying more free time as a result. But I don't really know that; it's not like I've tried it before.

Why would your spouse be jealous of your clone? She'd now have two of you, so she's more likely to get attention when she wants it.