Green Line CTA Violation

I was on the Green Line when an older man sat in the seat next to me. I was listening to music and looking out the window but then I started to notice that my space was getting smaller and smaller. I turned and the guy was practically looking over my shoulder and rubbing the crotch area of his pants. I yelled at him (I don’t remember what I said, this was months ago) and I got off the train at the next stop. I’ve been cat-called and people have made many comments about my boobs or whatever and I’ve just been able to ignore it but this was the first time where I felt seriously violated. I couldn’t believe it.