BeeBee was an "only cat" for the 19 1/2 years that we were together. I would have loved a companion for her, but she didn't like other people, dogs, and especially, other cats. If she even saw another cat through the window, she went berserk. "Flying solo" worked for her, but now I have 3 and absolutely love having a "multiple" family. I think they do keep each other company and they get along most of the time.

I think that as long as you give your cat plenty of love and interaction, it will be content and happy.