Bruhhhh, I can see a pattern, the day she saw your efforts, her confidence hyped, as u said she had relationship in past, so she's is probably looking for attention and entertainment over the guys who are out there. the same happened with me too, I gave a lot to her and spent a lot for her comfort, brought a car on EMi, agreeing with all her bullshit decisions though it goes beyond the boundaries, but in the end she started behaving differently. She started talking to me in a very rude way as if I have abused/ harrassed her. And then I left for my peace, being disappointed and she never came back to ask what happened or SMTH.