Ok - the long story short:
I met this girl, and we quickly became friends - always had a great time hanging out, talking, etc.
We started dating, and right from the start, we both *knew* we were in love - at least that's what she told me time and time again. I knew when I first met her that she was "the one" (kind of those love at first sight things) - I'm in my late 20's and had never felt this way before about anyone else. Everything was perfect.
Then one day, out of the blue, she tells me that she was not feeling it anymore - that she had 'cold feet' and she needed to not be with anyone anymore.
Needless to say, this was a complete shock and surprise to me.
I was completely devistated. I couldn't eat, sleep, concentrate - my heart was completely trashed. After a little while, we started talking again online - just to clear some things up. It turns out that she went back to an old boyfriend who had recently re-appeared in her life. She had been broken up with him for over 2 years at this point. He was the last person she had loved - and he had broken her heart.
We remain friends... however, I still have that feeling in me that her and I are meant to be together.
Anyone have any advice or similar experiences?