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The absolute worst thing you could do is bring this up to your sister in law. Seriously, that makes no sense.
The idea of a 'secret mostly non-physical semi-platonic friendship' is garbage. Even if you could pull that off it eventually would lead to "oops, my dick was accidentally inserted into you"
I say you need to reevaluate your marriage. Is this what you want? Is it worth fighting for? If so then get in counselling.
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