It's all a state of mind, while some people need to be with someone else, others enjoy being at peace with themselves. I, for one, love being single. Aside from going and coming whenever you want (without having to tell someone else or even excuse yourself, mind you), it is really nice to do things your way without having someone criticize you. If there's a mess or chores that haven't been done there's no one to be mad at but oneself; no bickering about who did the mess and who should clean it up.
Sigh...reminds me of Virginia Wolf's "A Room of One's Own"