Id say her interest level in you has been on a constant plummet due to the fact that you have showed exceptionally weak character in your constant change of opinion towards her and the relationship. You really showed no consistency in your lifestyle, behavior, or mind when you pour your heart out one week, and tell her its cool the next. One of the things I believe is a very large factor in attraction, which is congruency, you have completely abolished.
While I realize what I have just said is very harsh, Id like to say if you have hit 50 women you must have a good basis and I would like to believe that every aspect of your lifestyle (and game) is great, if not exceptional, except for your congruency. Congruency is simply the idea of staying consistent, or permanent in your lifestyle or reality. No women wants a guy who can change behavior (like your change in attraction), so quickly, because it means you could also change many aspects of your life just as fast. I'm going to assume that your confident and fun, but if your feelings towards her and the relationship and her can change so quickly, cant your confidence and ability to be fun just as quickly slip?
You scared this girl, and really have made her doubt you at your core. Since you showed you can change so quickly every part of your personality seems impermanent and weak. If you want the girl back, you show you can be congruent and consistent. Don't flip flop like a fish out of water when you want something, and if your gonna flip flop all the time, perhaps don't reveal it to her and keep it a Mystery.
I wish you the best of luck, if you get the girl back, which I have no doubt will have to be done through proving congruency, I applaud you. If you do not Get Her Back, I hope this serves to you as a lesson, and you truly cherish it. Failure teaches, success merely praises.