Where is my Love heading towards. Positive or Negative?

Well, Confused I am a lil bit. But I know I need to wait for time. Here is my story.

I and this girl (Jemshira) have been friends for over 2 years now. We both look so well together that when somebody sees us together, the 1st impression that they make out is if we are a pair. But she is a Muslim and I am a Hindu. She was in love with some Muslim guy (Ajmal) for 2 years (n still loving him) but they couldnt marry each other. This girl was in love with him but she couldnt dare to ask her parents out regarding the boy. The boy got engaged with some other girl a year ago and recently 2 months back, He got married to that girl. Now This girl Ariba was in a shock that her boyfriend got engaged. Ever Since that time, she had been crying over the matter. And I was her best friend so she used to share me every little feeling she felt about him. I was there with her almost everyday for sometime to listen all her sorrows and always tried her to pacify her so that she could come out of the depression. We eventually got attracted to each other. She started depending on me and I too liked her. Few months passed by, and we started holding hands, hugging, kissing each other. She always used to tell me that she was physically close to me just becoz she missed Ajmal. She always tried to make herself strong by being far from hugging or kissing me. No matter how much she tried, one of us has always had started the hugging and holding hands. Months passed by, Now we got very close to each other that one can say that we are in a relationship.
Actually, we work in the same project in the same company. This gave us chance to meet everyday and spend lots n lots of time together. Recently, I got relieved from the project and I got into other project. At that time, she could feel the pain of missing and she asked me that I should meet her everday. By the time this all things happened, I realised that I was in love with her. I was not interested to get relieved from the project as I will be missing her. Soon, I took her to a candle light dinner, where she couldnt resist hugging me for long long time. Then I proposed her. She was not surprised but she was not happy too. Her actions revealed that she cant love me but her eyes always said to me that she likes me.
Then a week passed by, we were the same, hugging and kissing and holding hands of each other. But finally we had a discussion regarding my proposal. She spoke out that she couldnt love me. She still loves her Ex. And she cant forget him. She believes only he was the perfect for him and she wants to dedicate her life to him. She can never expect any1 in his place. I asked her what was the problm with me and why she cant accept my proposal. She said that she cant be truthful to me as she has Ajmal in her heart. She continued further that she wants me as a bestfriend to her for a lifetime. She cant love anybody she said.
I said to her that I am sure she will be happy with me in a relationship. And to this, her reply was positive. She believed that she can be very very happy with me and she too knows it. But she cant love anybody including me just becoz of her past, becoz of her ex.
She thinks that she has dragged me into this relationship by moving close to me when she knows already that she couldnt love me. Now she is feeling very guilty that all this has happened just becoz of her. I tried to explain her that if love was to happen, then it will eventaully happen, no matter what the reason is.

Now girls and guys.. Please help me out. She likes me very much. I love her so much. We are a great pair together. She is kind of an angel-type-girl who can be found only in novels like cindrella and others. She is just awesome and I cant afford to leave her.
Please suggest me what does this girl thinks... I know I need to wait for time. But I want to know if my story is moving in postive direction or negative direction

First of all I didn't understand why the gal moved physically with you when she ad someone in her heart I.e her ex love. Does she needed someone to console her during her emotional phase?and you were that person?okay then now when your relationship has started ,why she remembers him still? Does she love you?But since he is married already it's better she focus her life in the present.She needs someone who can love her and take care of her and understand her feelings.I would suggest you, you open heartedly talk to her and ask her if she wants to be part of your life, if she wants you ,then go ahead and marry her with your parents consent. Otherwise it's waste of time if she isn't interested in marrying you.