She (let us say G1) was introduced to me by her boyfriend who is my friend one and half year back. We started talking as brother and sister. She said that she'll also has no bother so she would be more than happy to have me as brother. I also accepted her as sister. That days I was talking to another girl (let us say G2) but that girl G2 rejected my proposal. G1 know all this case as I had told her my story. I had told G1 that I can't live without G2. G1 had advised me to let her live alone and move on, there are lots of girls. I did that and stopped thinking of any girls. By then I had no such intention (or feeling)s for G1. Now I love her more than anything but can't tell this to her (G1) because she loves somebody else and also she says me bother. If I tell her my feelings, she may stop talking that I don't want. One thing I know that her boyfriend does not love her truly because he is behind a lot of girls. G1 is just an option for her that I came to know by his own words to me. G1 knows it because once I was telling this to her then G1 told me that she knows it already. But now a days he is forcing her to marry him because he is going to be 30 this year end. She is also 28 so her parents are also forcing her to get settled. Once she had told me that she has given profiles of 3 boys including her boyfriend to her parents for marriage purpose. I have told her every bad traits of her boyfriend while talking to her pretending as brother. But still she tries to contact her saying he is her best friend. Another info about her that she is career oriented. One reason may be that he is well settled. What should I do?

Since c stays in aother city, so d only media of comunication is email and phone. C has not added me in FB or orkut.Recently I sent her invitation to add me at FB, but c did not add me. C told me that c have deactivated her FB account when I asked her. Now a days c talks me but only career related matter. I frequently send her "I LOVE You" message but c does not say anything. Even today c emailed me "where are you brother?" how should I reply her? Should I reply without minding brother word?

I mean, how should I continue communication with her since c always addresses me as brother. Now I avoid saying her sister. Recently I addressed her by BABY world, c laughed saying "what are you doing brother". I told you are like a baby so you are now baby to me. Then c changed topic. Please advice me. Kindly help me..

Are you not in the US? Is there a cultural component to this?

We are from India.

You are like a brother to her so act like one, and if you cannot respect those boundaries then leave her alone, and do not betray her trust.

Get your own girl, and stop having a hidden motive to keep her in your life. That's dishonest, and not like a friend or brother.

She does not care for you as you care for her. You need to accept that and move on.

You are being as dishonest as you say her boyfriend is being. You are telling her things about him so you can hopefully move up a notch and you are pretending to be a brother to her when you know you want more.
Leave her alone.