I know exactly how you feel about being messed around
When me and my ex, who were admittedly VERY close, broke up all the time he was hugging me and stuff and calling and this one time he walked over to my house after school (I live like 2 mins from school so it's not a big deal) to talk to me.
Anyway like a week after we'd broken up, maybe 2 i lose track, he called me up and told me I just needed to let go because I was "all over him". I have never been so mad. I was just like ok no I'm not over you yet but it's been less than 2 weeks! And I'm not the one who's hugging you all the time and insisting we stay best friends right now grrrrr
At any rate my point is you guys broke up and it's hard for you both, but whether you started it or not, she dumped you so she feels like she has the moral high ground. She's gonna miss you too, but find any way possible to make you feel like it's your fault.
I'd advise giving her some space, and forgetting about being friends for now - just until you've stopped wanting her back.