I am alone (although soon to have a baby) and I love it. I don't feel alone, that's the wrong word even. I feel free, and happy.
I was briefly married and just don't think it is for me (he was abusive, but that's not the only reason, I just don't think I want to be a "wife", which does still seem to carry so many expectations with it.)
After that and then another short and disastrous relationship I had the epiphany that I had never been happier in a relationship than I was on my own. And my whole outlook changed.
I think society tells us we need to be with someone, particularly women in fact. So often I hear people say things about single women like "it's so odd she isn't with anyone, she's beautiful/lovely etc", without even considering it might be her choice.
This idea of the other half, that we are not complete, is very pervasive and destructive. I recently heard someone say "I don't have another half, I am a complete whole", and I loved that actually.
I'm not totally closed to being with someone in the future if they were absolutely wonderful and it was the type of relationship that worked for me. But I certainly am not looking at all, and it would take a very very special person to convince me to give up singledom!