My advice is next time you run into him, ask him on a date, it doesn't have to be anything too fancy, just ask him if he wants to go for coffee or a walk in the park, anything that will help you get to know each other better is a good way to get the ball rolling. The main thing you have to find out for yourself is whether or not it's him that you really like or just the idea of him. If you find that you like each other after a few dates then that's awesome, you can start to move forward with the relationship. If you find that there's a glass shattering realization about him, then that will give you the clarity to move on and find someone who is right for you. But either way the best next step to take is going on a date to get to know him better and find out where he stands when it comes to a relationship.