Need advice/opinions

Back in January when I was in my final year of school everything was going ok but then something happened to me. It was pretty serious and it has the police involved. Because I had my exams (GCSE’s) coming up the police tried not to stress me out about the situation too much but every now and then whenever I had to see someone it would stress me out and I’d be in tears after. It has now been 7 months and the person has not been found. I want to know who this person was as they really hurt me but at the same time nothing has happened and I really wanna move on with my life. I was a mess back then and i’m a lot better now thanks to my supportive boyfriend and friends but I’m about to start college and I just want my life back to normal with no more police meetings or seeing a social worker... What i need advice on is I don’t know whether I want to keep this investigation going or not? It’s taking a really long time and it has affected me loads mentally. Some friends think I should as the person should be punished but others understand how much it affected me and think I should think about my mental health and start new in college. What do I do?