I was assaulted by a primary school teacher and the guilt is eating me alive

When I was around 7 years old, I was friends with my neighbours kid and I used to visit their house all the time, their father was a primary school teacher and he used to touch my chest and butt, first it was over the clothes. I had no idea at that time, I remember feeling uncomfortable but I don’t know it was wrong. I also started tutoring from him after sometime and whenever we were alone, he used to touch me inside my clothes, he used to roughly touch my breast. I was scared but I don’t know what to do. I used to pray each day to not be alone with him. When a friend of mine joined that tutoring, I made sure she was never alone with him, even when he used to tell me to go because I don’t want her to feel that way.
I just didn’t know that this was wrong and I didn’t know what to do.

This kept going on till I was 12, my family shifted to another state. As I grew older, I came to realize what happened to me. Since then the guilt is eating me alive, that he did that to me and he was a primary school teacher, I am scared thinking him being in contact with children. I don’t remember his name or surname, I don’t know where is he now. Where we used to live, the city was huge, with hundreds of schools and I also remember that they used to transfer a lot. I am feeling so guilty that I did nothing and maybe he is roaming free, doing God knows what.