If you like this particular guy and you want him to make the first move by approaching you, try to use your body language to your advantage.
If you have noticed that he tends to look in your direction, make sure you return the eye contact and smile.
Oftentimes, guys look for signs of interest from a girl before they decide to make a move on her.
Try using your body language in this way.
If he likes you, there is a good chance that he will take your body language as his cue to approach you.