Sorry that you are in this situation. There is someone out there for you, and it will take a little while, but you will get there. I am also sure that when you find her, she will make you happier than you could imagine. Hope this helps, good luck to you.
If possible, you need to create some distance. Don't rush to fast to find someone. There may be someone right around the corner, but you need to browse the shop windows before getting to the end of the street.
Full text: I am very attracted to a woman I know, but she has already been snapped up and seems happy in her relationship which has lasted for a few years. I am constantly thinking about her, but I would rather that these feelings would vanish and I would be able to just be her friend. I don't think that she knows because I do not give anything away. She is out of my league, but I am hoping that the right girl will come a long soon who is single, but still carries many of the attributes she does.
I have the same problem, only its over a boy. Since he found out i liked him he hasnt spoken to me at all and its made me really upset. But with girls, some try to be nice about it including me and just sit and talk about it and explain, others are just bitches. But if she has a boyfriend, she might just like you as a friend. If you think it will never happen, just keep your friendship because you never know what it might turn into one day. And plus, most girls like the attention :P hope this helped
If you really want to care for her, enjoy the fact she IS happy and in what sounds like astable relationship. If you can do this you will be a step above most people my friend, some times acceptance is the only way over a issue. Good luck, rob.