Crazy crush on my teacher please help!!?

okay so i have the biggest crush ever on one of my teachers at university. he is only a few years older than me and is HOT HOT. We have a really good chemistry and he is always making eye contact at me and i do the same back. How do i show that i DONT have a crush on him anymore?? i dont want to be embarred knowing that he knows i like him in that way. HELP...also he is a really sweet, hilarious guy, and is everyone fave lecturer