Any chance of getting back with Ex?

Ok here's the scenario. I had been together with my ex for a year and a half. We broke up 3 weeks ago, and this weekend will make a month. During that time i made the mistake of not reading anything about what to do during these situations and i made a few mistakes. I talked to her 1 or 2 days before we were in our 3rd week apart. We met for coffee for something less than an hour (to keep it short) and it felt sort of dry. I met again with her yesterday for some lunch and i made my second mistake. I didn't hold in what i was feeling and i told her everything i felt and how i wanted her back, she started crying about it because she still loves me but she said that she just doesn't want me as a boyfriend right now. I think that is a nice way of saying that she just doesn't want me, but anyways... We broke up because i told her i was going to change some things with my attitude which i didn't in time, and many things struck her at once and the spark went away. During our time apart i completely changed my look, i got my teeth whitened a few shades, got some new threads, and so forth, so I'm looking good and feeling good. And i really want her back. We were best friends for 2 or 3 years before we got into the relationship and it really sucks to lose her. I've realized and changed so many things in this time and i feel like it deserves another shot! (she noticed some of the changes). Just this weekend i was going to go to the movies with her and one of our mutual friends but I'm planning to call it off because just being with her and talking with her on the phone often will not add any mystery and i will drop straight into the friendship and uninteresting zone. She is still being very nice and sort of flirty with me but she just doesn't want a boyfriend or she doesn't want me. So, what can i do from here? is there a way that i can spark things up again? i know it needs a little time...