Why is my ex confused about being with me again?

I'm not sure where to start. My name is Angela and I'm 22 years old. I was with my girlfriend Jodie for almost 4 years...we were so much in love. We moved in together after 4 months. On July 25th 2008 we had a misunderstanding over the phone which led to an actual break up...she moved out.. i begged and pleaded. I thought my life was over because i loved her so much. My birthday on the 29 th led to my finding out that she was actually in a relationship with a guy she works with which was actually a mutual friend. The first month they were together she was already sleeping with me again and telling me how big of a mistake she made and would talk about all the negative things about her boyfriend. We had actually met up once or twice for lunch to talk about getting back together and taking things slowly this time because she couldn't imagine not having me in her life. Especially once i told her that being friends is absolutely unacceptable considering the mutual attraction towards each other and the history behind us. She agreed that there's no way we could be friends. She tells me that she just fell out of love with me and that's why everything happened. I know for a fact that love is definitely possible again. It's now been 6 months, and we still talk. This last week actually we spent together having fun with eachother confessing our love for one another. She was trying to figure out a way to break up with her boyfriend so we could start over because she loves me. Then something stops her from taking the final step to making a commitment with me again. She can't figure out what it is stopping her. We need help figuring this out....She just told me on the phone she WANTS to know so she can move forward with me again. She feels like shes going crazy because we talk about it for days laying in bed with one another telling me everything she loves about me. Do you think she fell out of love with me? Could she still be in love with me and not accept that or be in denial about it because she has convinced herself that that's why we fell through? I just dont know anymore but I would lay down in death for her. She tells me that everything reminds her of me, when she kisses him she wishes it were me and she sits at her window hoping i will just drive by. She just doesnt know whats keeping her from taking that final step. I want to make the best life for both of us...PLEASE HELP!