How to deal with a crush . . . . . . . . . . . ?

You should just say "yeah, i sent you a gram I thought about how I would want one and thought you might want one too" something like that and let him know you don't hate him. He knows it was you, no need to hide it. He might be trying to figure you out, and that's why he is staring at you or he does like you and wishes to know if you really did send the gram. Either way he is thinking about you.