Hi Ali,
Yes, it would be best to wait until you see your crush again on Monday in order to determine whether he is going to keep ignoring you.
He has shown signs of liking you through sustained eye contact in the past.
However, you don’t really know what is going on in his personal life.
There may be a current or ex girlfriend in the picture.
He may even be at a point in his life where he wants to focus on his studies.
Before drawing any conclusions, wait to see how he treats you on Monday.
If he keeps ignoring, he may be indicating that he wants to focus on other areas of importance in his life.
In which case, the signs of interest that he had been showing you may have simply been out of curiosity and nothing more.