Most Helpful Guy
Be honest with him and ask if there is something there. Don't dwindle on something too long. when it comes to exs I always say hey a relationship with an ex is like a book you've already read, it has some good parts in the middle but you already know how it's going to end; but if you are determined then ask him. If he's not, there are others who will be happier with you.
Most Helpful Girl
try to give him some hint that you are still missing him. Maybe remind him of something you guys used to do together. it's a really good sign that you guys are still so close. However dont rush, the right time will come :)