Most Helpful Guy
Personally I wouldn't want to if I was your ex it would feel awkward. I also think if you do go through with it you tell her parents that your no longer together.
Most Helpful Girl
It's better you don't hide anything from your parents. They will help you in getting of this problem. Ask yourself first whether you want a bf/gf relationship with him or just a friend. If you decide to be his friend then him falling for someoneelse should not bother you later. Why did you break up with him?