THIS TIMES TEN!!!!!!! I'm not sure if I'm single "by circumstance", but after another gut wrenching breakup with someone who was NOT good for me, I decided to really search within. That's when I learned about and acknowledged my dangerous codependent behavior.
I had a list of things I wanted to do "with someone"... experiences, dates, vacations, etc. Then I woke up one day at 39 years old and realized that I hadn't done a lot of it because I was still waiting for a companion. The women in my life either had families of their own or back peddled when I suggested doing things, so I grabbed the bull by the horns and started doing things by myself and FOR myself and I can't be happier.
I think the key is really learning to love YOU. Realize that life has LOTS to offer and that you can enjoy your journey solo. The more you honor yourself and do things you enjoy, the more like minded people will enter your world, and you may just happen upon that special someone. In the meantime, enjoy the most special of someones... YOU!!!!!