How do you get past the fear of attracting another horrible relationship?

My ex-wife was a sociopath. One of my ex-girlfriends was a sociopath. The rest were normal girls. If most people were sociopaths, they would be "normal" and there would be another adjective to describe the rest of us-- something along the lines of "chump" or "sucker." You just move forward being aware that there are sociopaths, but also aware that they are a minority.