Uhmm.. please help..?

okay there is a teacher whom i like... and ohhh god he is married!!! ughhh! but he always gives me a tingling feeling through my body.. and is so HOT!!! what should i do when i see him wandering the halls..? should i smile and be normal?? ohh godd! he is sooo cute! but he is married.. what would YOU do???? please help..