This happened in my HS, but not while I was there.
The son of the dean, newly graduated from college started teaching 12th grade calculus. He and one of his students fell in love and got married. They did NOT start dating until after she graduated.
Then again, this wasn’t a Judaic studies class, but after that happened, I think they didnt hire young, male, unmarried teachers anymore.
My calculus teacher was a crazy (but brilliant) man who didnt really look at us. But, he didnt look at men either. I think it was just part of his oddities.