And there I thought this was the old thread. Really, my dear, this shows that you really are an obsessive kinda person. Give the girl a few weeks' space, then maybe send her one text, or one email - not both - and maybe say,
"I really would like to be friends again, and I'll learn to change and give you space. If you're willing to give me another chance, contact me. Otherwise, you won't hear from me again. I'm sorry for everything."
^and STICK to that promise of "not contacting her again" if she doesn't respond. Then she'll know whether you've really changed. And if she still doesn't wanna be friends with you, isn't it time to move on? You've learnt your lesson.
Being obsessive with anyone will scare them away. I know I became obsessive with one of my good friends as a teenager - I'd get her elaborate presents for Christmas and her birthday, I'd keep any photos I had of her, and I'd constantly want her attention. Lol I mean, she almost literally got her very own stalker! But I knew it and as far as I'm aware, I didn't show it and she had no idea. I'd get jealous whenever she was hanging out with someone else and it felt like she wasn't my friend or didn't wanna be my friend. In the end I had to curb my own obsession and after a while, it died down, and I've not been obsessed with a friend like that ever again. We're still close friends to this day and she still has no idea I used to be obsessed with her, though I'm not anymore.
^I mean, if you're anything like me AND you showed it, I can understand why your friend wants to avoid you, cus on hindsight, such behaviour is stalkerish and truly frightening. I was young though lol.