Time to move on, you have given it your best shot, let her know exactly how you feel and you can't do anymore than that.
Most of us have been there, I certainly have more than once I can tell you, please don't think this situation or feelings is unique to you because they are not, and we are all still here. The best (and also worst to hear) advice is that time is the greatest healer....
One of the biggest problems I had is that if you feel sorry for yourself then you project that image and you won't meet anyone which then makes you think you were right and the circle continues.
There must be something good in your life you can focus on, a friend or a passtime anything just try to get this woman out of your head and stop thinking this was your one and only ever chance if happiness because it wasn't trust me.
Try to resist the temptation to keep in touch just in case she changes her mind, just let her know that if she does she knows how to contact you and leave it at that.
Use this experience to make you a better person