Female friend knows I like her...

My female friend of about 9 years knows that I have serious feelings for her. The problem is that she does not address it at all. The dynamic never changes, and she's very loving and supportive no matter how I act. She also won't tell me that she doesn't have the same feelings for me, or that we're just friends. She's just OK with ignoring it. I met her when she was dating my friend, whom I've grown apart from over the years while she and I have gotten closer. As a consequence of this, among other things, I've never tried to make a move on her, but I am very open with my feelings with her. Can anyone tell me what she's thinking, because sometimes I feel like there are very mixed signals being passed back and forth. I'd go after her in a heartbeat if I knew that it wouldn't destroy our friendship, and cause my friend (her ex) pain all at the same time. Any ideas are welcome, thanks.
Female friend knows I like her...
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