Should you have more than one cat?
You can, but you don't have to. If you already have a cat, base
your decision on its personality. If it is very anti-social, don't
get another cat. If your cat is friendly, you can get another cat.
But if your friendly cat doesn't like the new cat, get rid of it.
If your cat doesn't care, you could get one, but the decision is
always up to you. I'm not a professional, but this is how I would
approach it.