I completely understand your feelings about police, Robbed. I was sexually assaulted at the Veteran's Admin hospital by an employee and the police refused to take the evidence that would have put that guy in jail for a federal crime. They were friends with the guy, so he still touches patients every day; his jib was never in jeopardy. i don't trust police either.
If you do decide to get the police involved, make sure they send female cops to your house and tell the females exactly why you dont trust them; they will fully understand your feelings! They live this job and they know first hand about discrimination and how women who have been sexually assaulted feel about police in general.
Can you move somewhere else so you can get away from him? Can you find out if the perp has a criminal record or history of accusations? Can your landlord make him move out (If you live in the same complex)?
Keep telling yourself that you did nothing wrong in this situation. He took advantage of your sweetness and generosity. You are not at fault in this one bit. I felt the same way as you do now when I was assaulted. What could I have done to prevent it? Nothing because he pre-meditated his attack on me. He set the scene so that I could not get away from him and nobody would hear me call for help.
In many sexual assaults, the perps pre-mediatate the situation so that they won't get caught and so that you will agree to see them, be close to them, sometimes at night when few people are around, or in my case, when the hospital was shut down for a long holiday. (I had a broken ankle, so when he took my cast off, I could not run away). The perp is someone we trusted, someone we didn't think would cause us harm, but we were wrong.
You and I did nothng wrong. It's so easy to blame ourselves, that's what we do automatically. But we did nothing to provoke this, we did not ask to be hurt. Those men are predators.
So many of us on this forum have had this same experience as you. At all ages. We are survivors, not victims.
I hope you get therapy very soon and I hope that you do whatever you feel is necessary to help yourself heal.