Why would my husband hide styrofoam cups? Does this have to do with his diabetes? Alcohalic consumption?

Ask Him. Ask him directly. If you are concerned about possible alcoholism, you need to be very aggressive in getting him the care he needs. It's possible that this is a nervous disorder, like some sort of obsessive compulsive disorder, but more information is necessary in order to help you with this. Good luck. Try your best getting the answer from him directly.