How do you know when a guy likes you if he glances at you?

It depends how he glances at you. Some people just stare at other people and don't realize they are doing it. The best thing you can do to test the waters with this young man is to smile at him and say hello. If he is interested and seems to be an out-going kind of guy then he will ask you out. If he is shy, you ask him out. Good luck Marcy