I'm fortunate to have an excess of great dive buddies to choose from. But sometimes I just enjoy the solitude and freedom of diving alone.
Solo diving shouldn't be viewed as an alternative to a lack of buddy skills, or because you've had bad experiences with inadequate dive buddies. Those are completely separate things, and should be considered for different reasons. And if you're going to dive alone, make sure you have the skills, the equipment, and mentality to do it responsibly. People tend to overestimate their abilities, and it's only when you have to deal with an unexpected issue that you find out what they really are ... keep in mind that when solo diving, there isn't likely going to be anyone around to bail you out if you've miscalculated your ability to deal with it. So make sure you've thought through why you're doing it, how you're doing it, and what you'd do if the dive didn't go as planned ...
... Bob (Grateful Diver)