I used Nancy when my RB Speckles passed. I wanted to know if getting another kitty for Max would be a good idea. Well, Nancy made no hesitation either in informing me that Max absolutely wanted no other cats in the house period. I did see a noticable difference when Speckles left so I know I made the right decision.

Just looking at it from the outside and trying not to make any judgement calls here, my gut instinct screams "do not get another kitty", then again, I don't really know your "household behaviour". Sometimes kitties will surprise us.