If you were me what would you do?

So me and my boyfriend are coming up on our one year so we still clearly have things to learn about one another... But I have a big one. I was groped by my cousin when I was younger. I know it's a big deal but it surprising hasn't affected me in my adult life and I am fine with it. But I think my SO should know because we are serious. We are both 17 and were graduations high school soon and he is my first love. If you were me how long would you wait to tell him? 
PLEASE NO HATE

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