Ask yourself this, will it help YOU to tell?
I mean that as a non-rhetorical question. If you NEED to see him punished to heal, then you should tell. But you don't owe anything to anyone else.
If it will make your life better, and help you heal, then yes, you should tell. But if you don't think it will help you, don't.
This isn't about how others perceive your actions. It isn't about what others think is good for you. You are the victim, and you should do what is right for you.