Hi Gabriel,
The fact that you and this girl in your class keep glancing at each other but never make eye contact may mean that you are both attracted to each other, but shy.
This is also further indicated when the both of you try to look at each other at moments that the other isn’t looking.
These are typically strong indications that the both of you are attracted to each other but are too shy to make eye contact and be found out.
This is typical behavior when it comes to two shy people who are attracted to each other.