I read your original post and a few after it. Let me say this - she's 17. She isn't sure what she wants. She's receiving a LOT of Beta male attention (perhaps even yours) and is wondering who else might be out there she could sample. This is not about you, or who you are, or what you did etc. This is about a young girl-child who is on the verge of blossoming.
These young females, they are shaped by beta males. Eventually they are the ones you guys end up b!tching about. They learn young, and quickly, that there are men who will be subservient to them, do things for them, buy stuff for them, all in the hopes of getting a piece. The beta buffet is too rich not to sample.
Dont be part of the beta buffet. Be the alpha male, the one that got away. She will quickly forget the beta buffet boys, but she will be hard pressed to forget the alpha's she comes across.
NC her. Move on. She needs to come around and you really want her to come around in her mid 20's so she understands what a quality man looks like (you) and is ready to give him her all. There is no telling what will happen in the future but I can tell you one thing - of she is meant to be with you LTR, she will be back. Otherwise you need to look for your LTR. Dont get hung up on something that is nothing, you know?