What's up with her???

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/adv/, my story is a kind of a long one and has common beginnings but not so common developments.

I went on a date one year ago with a female acquaintance that said she had a boyfriend... during our date. I was about to drop her after that night until she made the push to become better friends with me instead of dropping each other.

Fast forward to this summer and we've been great pals but I didn't quite get over my feelings for her, despite dating two other girls. I tell her my feelings, expecting rejection but she didn't flat out reject me, which surprised me. She fought herself when I spoke to her on the phone and she drops a two bombs on me.

(First), her boyfriend is actually a close friend she sometimes goes on dates with and has been subsequently waiting years for him to settle down with her.
(Second), she knew all along that I had for her and would have told me about her pseudo-boyfriend. The kicker is that she knew I would have assumed she was available to date. She said herself that she knew I would be nicer to her if she had admitted it earlier.

She has been a good friend, up to this point. I'm debating about walking away, even if our friendship was good. I'm so conflicted right now...

Anything helps, guys.