Think of something really bad that happened to you five or more years ago. Are you still miserable over it now? Is it still crippling your life? I'm guessing "no" and "no" would be your answers to my two questions.
This is very much the same although it is difficult to feel that way. If you two were in love, it should not be good enough to you to let her just say she is not in love. You should at least ask if there was a problem or an issue that you could address or if there was something she wanted but wasn't getting. Communication is very key. But, in the end, it doesn't always work out.
Remember this, someone did want, need, like, and love you. It ended. But she did. You will meet many, many people in your life - and I would encourage you to meet as many as you can. You should consider it inconceivable that not one of the thousands of people you will meet will be able to want and love you. I consider it inconceivable. It just always takes more time than we want ('cause it's such a wonderful thing we want it NOW).
Oh I ve had the same problem and it still pains me. Today I´ve got new news, she thought, that I love her too much, or something like this, I can't explain it in English. She was right about one thing - I would do everthing of her! But she didn't like it, she could say a word about it, but she didn't, she turned her back on me without any word of complaining. Nothing jsut SMS. I had some problems with it and i've hurt her this month too many times, more than she perit. I've realy loved her! But now, i have another girl, and i hope it will be better tahn with the old-one.