So I don't know what to do.
Most Helpful Girl
I would say don't go for it cuz she hurt you once, but If she wants you back it's probably because she's always regretted leaving you. like you were the one that got away. Ask yourself do you want her back or no? do you think you can trust her again. If no then I say don't go for it but if your like big on second chances and that trust is built over time and you still like her go for it. Also ask why she left you the first time might help you make a decision. whatever you choose I wish you well