Fuck him. Creepy? He lied to save his own ass. You chose to be a nice guy and tell him that you have proof that he read the email before telling the teacher this. Instead, he goes off on you?
Does he know how easy it is to forward that email to the professor? Followed by a very nice comment along the lines of.. this is the type of person who runs your class when you are busy.
"It is better to be hated for what you are than loved for what you are not."