I'm sorry you have to go through this. It must be horrible, all I can really suggest is keeping your head up and concentrating what matters:
friendships, family, schoolwork, your future etc. Give it time, eventually people will forget what happened between you and that guy.
Any guy who is actually decent shouldn't care about your past, which in your case isn't even that bad considering it was one guy, neither should they label you as easy due to those two interactions. Stay strong x