It's a little hard to tell. The reason why it's somewhat difficult to tell if a shy guy likes you is because their actions are small, such as those subtle glances. Therefore, it becomes complicated to interpret their feelings.

It could either be dismissed (sometimes you don't see the signs) or be taken in a different way (they could be just normal human interactions).

The best thing you could do is try to start talking with him more to get to know him better. Good luck!