Lisa and PDM have given you some very good advice. A letter is a wonderful idea, something she can think about, keep, and maybe even cherish. I still have all my old love letters and they bring me good feelings.
I wish you luck, i really do...but also agree that you may have hurt this girl beyond repairing. Let her make this decision whether to date you again on her own time and space. If she DOES agree to try again with you, please treat her like a princess.
She will deserve that, by having the courage to open up to you again. She sounds like a lovely girl.
If she decides she can't open up to you again, it would be good for you to respect that and not push. You will have learned a very valuable life lesson you can bring to your next relationship! That is also a good thing! We all make mistakes: the measure of a man or woman is what we do with them. If we can learn from what we have done, accept our mistakes as part of being human, and strive to be a better person next time.
Good luck and please let us know how things turn out!
