Some of the advice given in the previous post were pretty good. But EVERYONE has skipped the most crucial part of this entire situation. You need to figure out what went wrong. If you don't learn from your mistakes, you will have this exact same problem in the future.
Many gave advice on how to get her back, but nobody told you what you need to do to keep her. Sure, by playing some of these mind-games you may be able to spark her interest again, but then what? After she gets back with you it will only be temporary because you haven't changed. Let's be honest here, it takes TWO for a relationship to work. You must accept some liability for the relationship ending - you haven't demonstarted this in any of your posts.
Let's try to figure out why she broke up with you:
Whatever bull reason she gave for breaking up with you was just because she didn't want to hurt your feelings.
You are 32 years old, I figure she is somewhere around that age also. You said that you are not the marrying type. I guess this means that you are also not the let's have kids type.
It makes perfect sense to me why she broke up with you. She meets this new girlfriend of hers and this girl has everything she wants: a great job, an awesome HUSBAND, etc (this is the kind of stuff all women strive for). Your girlfriend realizes that she is moving on in age and that your relationship is not going anywhere, she expresses this concern to her girlfriend, whom she envies. Whatever advice is given to her from her girlfriend will be treated as "gold" because the girlfriend has the results to back it up. The credibility of advice from her girlfriend is reinforced even more because of the girlfriends ability to land her (your ex) a new, better job. Your ex accpets advice from her gf on how to get a new, better job and it works, so it would only be natural for her to want to hang around the gf more and take more of her advice b/c the previous advice worked wonders!
It's obvious that your ex is currently in a phase of moving on with her life and "finding herself." The whole I need time to find myself was not a load of crap, but partially true. She doesn't need to find her self, because she already has. She knows what she wants and it's not you. Typically, women like to get new boyfriends when they make serious changes in their lives: graduation, new job, moving to a new city, etc. It's kind of like getting rid of old garbage.
You are 32 years old and she is moving on in age too. You have been with her for 4.5 years. If she truly meant the world to you, then why isn't there a ring on her finger? Oh ya I forgot, You're not the "marrying type."