At this juncture, if he were to continue staring, he would be playing mind games with you. This is not a situation that you should allow yourself to get drawn into.
It would be best to just avoid making eye contact with him altogether. This way, you don’t risk getting caught up in those mind games if he chooses to continue staring at you.
If you avoid making eye contact altogether, it will be hard for him to keep staring at you because you wouldn’t be giving him anything to work with in terms of acknowledgment or reaction.
This will most likely lead to an end to the staring.