I broke up with my ex-girlfriend for a year, and we are still in contact. She said she wanted to talk to me about old times, should I agree?

It's best not to agree. As the saying goes, "There is no turning back when you shoot a bow." Besides, you don't fully know what changes your ex-girlfriend has had in the year since they broke up. What if you make a mistake with her? If you can't explain clearly what you did or didn't do, then you will suffer the loss of being dumb...