Fiance Wants Space And Is Now Dating

My fiance and I have been dating 11 years and engaged 2 years.She was 14 when we started dating and i was 17.I do admit over the course of the relationship I was over protective jealous and insecure.She is a very pretty girl and I would never let her out and complain about what she was wearing and got mad at her when guys looked at her(even though it wasn`t her fault).She has told me she has been thinking of leaving for 2 years and every time we had fights I would say how I would change and things would be better.I would change for a week and then back to normal.She tells me now that she loves me but isnt in love with me.we broke up about 3 weeks ago and since then in the first week we slept together 3 times and she was still wearing my ring, and every time i asked her if she wanted me to move my things out she said no( I am staying with my parents for now), and would cry and get upset. Last week she took off the ring and went out on a date. We spoke about it and she has told me she resents me for "taking her youth". She feels like she is "missing out" on something.I have told her once again I will change and have an appointment set to see a councelor for Jan 6th, to try to see if i can overcome my ways and to see if the relationship can work. I have told her several times over the past 3 weeks "if she wants me to give up hope and stop calling or trying ..tell me and I will leave you alone"...she says thats not what she totaly wants.
Origanlly before she went on the date(which she later tried to downplay) we were supposed to go to this meeting together. I told her the only way i wanted her to go is if she wanted to try to work it out...otherwise in my mind if she doesnt want to work it out, then she doesnt need to be there and i do try to get myself better.
I really lover her with all of my heart and know i didnt treat her right and would do whatever i need to to try to make what ive done right, but i also know i will not go back with her if she is out there and being intimate with other people(which i dont know if she was yet).
I left the ball in her court and wrote her an email saying....the meeting is jan 6th........i will be there.....if you walk through those doors it means you want to work this out, and that can mean us living seperate and going to councelling and you can still hang with your friends and i wont say a word..but no dating others......if you want to date others and hang out al night that is fine but she must know it will be 100% over and final forever..........so thats where im at....does anyone have any advice for me........all i can think about is her...11 years is such a long time and we have been through so many things....is it possible that she is really ready to have it over for good and forget so quickly?