You only knew this person as a teacher and a positive role model, you didn't know his other side, so you grieve. If you can, try to let go of your feelings as soon as you can, otherwise you'll drive yourself crazy and tear yourself in two.

In the UK, we had an entertainer who died a couple of years back. He was highly respected and seemingly did much good work for charity. He was molestor with hundreds of victims and he used his fame to access vulnerable people and his good works to create an unassailable image of respectability. Only after this man's death did the scales fall from people's eyes so that the victims were finally heard.

Sadly, there are too many stories like this in the world. So don't feel guilty that when you knew him, you liked him, he was skilled and manipulative and made people like him. What is important, is that you put him behind you and concentrate on the here and now and straightening things out with your boyfriend.

I guess there is probably a helpline for people who knew this guy to contact, obviously the FBI would want as many victims as possible to come forward, but also the schools that employed him need to offer support too. I'd suggest contacting a helpline as they will be able to guide you through your confusion.