You best come forward to the school principal and especially , The police department , This is a VERY SERIOUS matter , The person doing this is a FELONY in which he could very easily go to prison and also , Will have to register as a sex offender , Please , Please Don't ever let this go , Who knows what further harm he can do , Also , How many other women has he done this to , and the real danger is , This can escalate into rape and/or murder , Terrifying but true , Don't let it happen to you , Report this IMMEDIATELY ! , Remember .......SAFETY FIRST !!!!
Expect a lot of questions. They are going to try to get as much information out of you as they can. Also expect law enforcement. I hope that sick jerk gets what's coming for him! Sorry for what happened, good luck. Have a good day.