As with all matters of the heart, there's simply no set timeline to dictate when and how to move on from a painful break-up. If the thought of dating, let alone having a relationship with another person makes you queasy, it's probably best to hold off for a little bit longer. Once you've worked through your emotions regarding the failed engagement and feel more comfortable with the social scene, by all means, get back in the dating game.
Who knows? It could be easier than you expected to get over your former flame. You might even thank your ex when you meet that Brad Pitt lookalike with the beach house, fancy car and penchant for sending you fresh flowers and candy. A girl can dream, right?