How Do I Tell My Dad His Only Daughter Was Sexually Abused?

I distinctly remember my Dad warning me off that 17 year old boy when I was merely 14. He told me time and again. He never liked him. Now, he refers to him as "that a**hole", but he doesn t know the half of it. How do I tell him that I, his precious daughter, was sexually abused for a year by "that a**hole"? I was diagnosed in December, but I ve been suffering over the six years since it started. Very few people know about my PTSD, one being my long-term partner and the other my best... How Do I Tell My Dad His Only Daughter Was Sexually Abused?
https://www.myptsd.com/c/threads/how-do-i-tell-my-dad-his-only-daughter-was-sexually-abused.60932/