Being single for about a year, my answer is yes and no.
Being single can be lonely sometimes, especially when all your
friends are either attached or getting married, its so hard to have
a guy's beer session. I don't know bout the others but that's how
it is for me..
On the good side, being single means more discipline in doing
the things. I'm less distracted and can study/train better without
a relationship =P cuz when I'm attached I think about having fun
all the time and basically got lazy.