Being dateable isn't about how many "babes you've bagged" (and heaven help you if that's how you'd express it) or how over-the-top sexy you are. It's about being confident, independent, fun, and interesting.
Basically, being a quality human being. Are you one? Four questions to ask yourself.
Great Date Quotient #1: Happy
Sometimes singlehood is a self-fulfilling prophecy. Get bitter about how there aren't any great guys or girls out there, and you're destined not to see the ones there are. Does an angry, unhappy, desperately lonely person sound like someone you'd want to date? Didn't think so. Figure out what it takes you make yourself happy (hint: the answer is not "a husband" or "a wife") and do it.
Great Date Quotient #2: Open
Part One: You stop mentioning your ex oh-so-casually a gazillion times a day. That's obvious enough. Part Two is trickier. You need to stop blaming the poor loser for everything that went wrong. It takes two to ruin a relationship, so no matter how evil your ex is, there was something you did (even if it was simply putting up with it) that makes the end of your relationship even a teeny, tiny bit your fault. If you ignore your own responsibility, you're that much more likely to do the same dumb thing again.
Great Date Quotient #3: Ambitious
It can be as ambitious as finishing law school, going into government and saving the world, or as relaxed as planning a trip to Hawaii and figuring out how not to kill every houseplant you're given by well-meaning friends. Basically, having plans, dreams, and goals shows your willingness to grow as a person. And that's a pretty attractive quality.
Great Date Quotient #4: Self-Knowledge
Your list of qualities for an ideal mate should be more specific than "not a loser." You're not likely to find what you're looking for if you don't know what you're looking for, after all. During that relationship downtime between mates you need to get specific about what it is you're searching for.
