According to Emode.com, the reason I am single:

Once the blush of first love wears off with your partners, do you get a little antsy? You probably crave excitement in all realms of your life, and you need a relationship to keep you filled with possibilities. Let us guess: Someone has probably told you that you haven't quite grown up yet, that you're still holding out for the perfect "whatevers" (job, car, home, date) in your life to come a knockin'. Or perhaps you're just having a difficult time accepting that your comfortable little place in this world is always growing, always evolving — and that means you have to be willing to accept big life changes, too. Not that there's anything wrong with that. After all, you're probably a lot of fun to be around and may be the life of the party.

But when it comes to settling down, you leave without looking back twice. Now's the time to ask yourself: Why? What's holding you back? Maybe you don't want someone to get to know you fully? Perhaps by saying "yes" to someone, you're afraid you'll lose yourself, or the possibility of something better coming along. Just remember that the best relationships are those that never stop growing. That's something you can identify with, right? So keep that in mind next time you find someone you're really comfortable with. You never know, it may prove even more exciting once you really get to know each other, teensy flaws and all.
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And my romance pattern is:

Love is all-powerful in the Romantic Rescue pattern. It is the catalyst for change within yourself as well as the means through which you discover if your partner is who you want and need them to be.

But, here's the recurring pattern you may see in your relationships: A desire to save your partner from his own self-destruction, or the desire to be saved by someone for the same reason.

Some people adopt the hero role in this pattern — nursing an ailing partner back to health, saving them from a string of previously destructive relationships, maybe even saving them from a physical danger. Others cast themselves as those in need of rescue — relying on their partners to swoop in and save them from whatever ill-fate's been visited upon them, either real or imagined.
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Creepy... and that's all she wrote.