I didn't report mine because it was effectively date r*pe the first time...but after that I went back and even though I still strongly didn't consent, it happened again and again. I don't know why I went back. Well I do, but it's a very complicated emotional thing and I was quite mentally unwell at the time. I went completely the opposite way and became very promiscuous and got myself into loads of bad situations where I just wasn't present while stuff happened that I told myself I was comfortable with when I wasn't. I didn't really let myself even figure that any of it had happened for at least 3 years. Anyway, they'd have never believed me especially with me acting like that. Also there was another person involved and he was highly intelligent and would have never been viewed as anything other than a model citizen.
I told one friend about 6 months after but then it kinda disappeared, I had a lapse into psychosis and that kind of took over. I mentioned it in therapy a year ago....then recently I sought out a therapist who specialises in trauma, and told my boyfriend - once we lived together he saw a lot more of my PTSD and I needed to explain it to him. I've always made sure anything I say in therapy leaves them anonymous, which is helped by the fact that there are memory holes, including their faces and exactly where it was.
Sometimes now I regret not reporting it, because they might have carried onto do it to other people...but I honestly just think that if I had they would have simply got better at hiding it, or they would have made it even worse in terms of emotional abuse for any people so that they wouldn't dare report, and I didn't want to be responsible for that. Even if that wasn't the case.