I think I just avoided being assaulted
How do you feel right now after this potential assault?
My mind is racing out of control which is why I'm thinking about what could have happened.
I'm sorry you experienced something so traumatic, but you need to report everything that you can remember. You can't let the potential assaulter get away with it all so they can harm someone else.
I should let it heal and fade away. Get over it and breathe.
That is good advice for yourself for the longer term, but for now, you need to report it while the details are still fresh in your mind.  You could potentially help the police to catch this predator, but if you keep quiet, he might get away with it next time.