At the first place, it should be your choice if you want to take up on the chance and get back with her. But, in my opinion, I would suggest you do not. These kind of cases always turn into a hectic and toxic relationships, you should know that if she is with someone else and she is telling you then not even she is clear on her end what she wants. If you take up on it then it will be a mistake and will not something you can handle later. So, step out of this mess and focus on something else.