My girl and I own 3 cats and we have already talked about who would get which cats if we were to split, she would take 2 and I would have the other.
Hope it never comes to that but they are important enough to both of us to feel the need to come to the best solution if the situation ever arises.I don't believe either of us would ever consider giving them up for a new friend , they would have to take the whole package or nothing.