EX teacher's husbend pushing on me?

I am in my 20's and I work around students. I found out that one of the teacher's that I work with wife use to be my teacher. He is hitting on me everyway possible. He asked can we be down. I told him that I respect his wife to much to be the other woman. He is trying to give me things to get me to change my mine.

I try to avoid him at work but, the place is small. Man in a couple of years his wife will be teaching my kids.

Some of my friends that I asked tell me talk his money and be happy. What should I do? I know soon he will want more, man he is already talking about that!

I mean he is attractive, but I respect myex- teacher too much to cross that line. And I scared that if I was to cross that line I seen how some married man go crazy when they see their other lady in the street with another man.