I see what you mean. My best advice is just be her "best friend" keep the romantic talk out and just have good, normal conversations. Eventually, down the road something may happen to where she might want to get back you. But in the mean time, I say "Do You" and be this "best friend" and nothing more.
If you crack and show her that you will "wait forever" for her, she prolly may never get back with you. I'm just saying.