I want to share my part of story

I always had a best friend. The difference was.. she was from the opposite sex. We were so close to each other. we loved each other so much. But we never thought of a marital relationship. Once I saw her with a boy (other frens) who was dashing and then a sense of different feeling came into me and i started feeling it might be because i am in love with her. This was as usual. I again came to normal. we always flirt with each other. I knew that there were times when she was always bluffing stuffs.
One day we went for a date and then she said that she loved me very much and cared about me so much. We just went on laughing, I thought that it was some of his another joke. I came home and again thought on this..
The very next day she again reminded me of this and he wanted me to reply. Then at that moment i thought,, she was saying for real. I came home and thought so much.. Then i came to a solution that i am not going to be in a relationship with her and i said no.. I had my reasons..My reasons were that.. I felt that she was just a good friend and the very best too. But she shall be a bad wife because she always flirted and she goes on with her bluffs many times.. But today i realize if i had married with her.. she would care for me a lot .. because she not just flirted with me.. But loved me so much and cared about me so much..
I know this today.. but what to do, I realized but i am too late....I can't purpose her now..

she is living a very successful life and she is being a very successful wife for her husband. I can see this today.. I never thought that she had this seriousness in her. I always thought that she is just a lover boy and a fun loving boy.
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People say "when we are in love it's nothing but just a temporary madness". But different people have different views. The only thing to do when you are in love is to... Express it before it's too late.