We all seem to try to go back to the 'comfortable', the 'known', over the unknown, even if it is not good for us. No one relishes being alone - at least not for long.
I think the best thing that I ever did for myself was take a 2 year hiatus. Coming out of a very deep loving relationship that worked on so many levels, but sadly did not have the power to last, I put all my energy into other things. I spent two years not dating. I didn't just decide 'ok, for two years I will stay alone". I just kept busy with friends and hobbies, my dog and my family, not worrying about a time frame. It really opened my eyes to what I wanted and what I did not want. And then when I least expected it someone wonderful walked into my life. That hiatus was the best gift I could ever have given myself.