It means he likes being single.
First of all, I know men have a habit, especially when it comes to women, dating, "love", what-have-you, of double-speaking. They say one thing but it means something COMPLETELY different.
No. Not really, no.
To repeat, hell no.
Most guys mean what they say and we are fairly simple creatures. We may have complex hobbies and have done a lot but we are simple at heart. Doublespeak is what women do all the darn time and it annoys the hell out of most guys. We don't want to hear 3 minutes of oblique leading questions where we are supposed to read your minds to find out that you are hungry and want mexican food. A simple "Hey, I'm hungry for mexican" works wonders.
Some losers lie and say whatever it takes to get a woman into bed, but that is not doublespeak. It is called lying.
So getting back to what does he mean when he says he likes being single?
It means he likes being single. Duh.
In your life 95% of the heaven or hell you experience will be due to the choice of your mate.
Its much better to be single and lonely than married and lonely.