You'll stop that when you find the person that makes you think how much you DON'T want to be single, and don't want to be without them.
By dating enough people for long enough to know whether or not you want to get married or would just rather be single. Sooner or later, you will know, one way or another. Most people have ambivalent feelings about commitment and marriage. Keep on dating, don't worry about it for now, don't try for a monogamous relationship, just have fun. Sooner or later that fun will wear thin and you will want something more--or you will discover that you are one of those rare people who are just not meant for marriage.