Not to argue, but I've had housecats most of my life (remember Harold in the Barbie van? hehe) and I do see that they benefit from the company of other cats, and actually enjoy it very much. I know the "experts" will disagree, but I've experienced it first hand many times, having had 10 cats so far in my life. And they don't simply tolerate each other...they groom each other, play and sleep together, etc. While they may not have the "pack mentality" of dogs or other animals, feral cats do form colonies...they just don't have the power structure of a pack.

It's been 2 months since the older cat passed, and his behavior is getting worse, not better and I know it's because he's lonely and/or bored. Since I can't quit my job to stay home and play with him all day, the best solution to the problem is another cat.