I think the real concern in diving with your SO is the additional emotion that might cloud judgment IF a serious situation developed and you had to apply rescue or other emergency techniques. Would your mind be clear in doing so, or would the added emotions prevent you from clearly engaging the techniques.
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Don't overlook the insurance problem... things not going well at home, does she really need a full tank? Maybe she could do EAN 50 for the 120 foot dive.... then there is the 500K of insurance, and she never did like to boat dive anyway...