How can you stop blushing in front of this guy?

just feel more confident around him and start talking to him more :)

drink some really cold water (can be a waterbottle) and wait a minute or 2. take deep breaths and if you feel yourself blushing look away for a second so you don't feel self conscious like at the clock. or if your in class start working on your worksheet. its one of those things where if you can't see the guy its like he can't see you even if he maybe can. if hes nice then he wont say anything. if he says something obnoxious maybe you shouldn't care as much.