Can anything be done?

A little over a month ago I finally got the guts to file charges against the guy who raped me about 2 and a half years ago. An investigation was done by the police but because there was little evidence after two years it was a he said she said case, and he could only be charged if he admitted to the rape. A recorded telephone conversation was set up, but after the conversation I knew something was wrong. Unfortunately, he didn't confess, and half way through the conversation he asked me why I sounded like I was being recorded... When the police went to talk to him in person he refused to talk to them and just said he wanted his lawyer. That was the end of it. The police told me that if he ever tells me anything incriminating then they can investigate further... I decided to contact him to see if he would say anything about the case or if he had known beforehand that I had gone to the police. Nothing worked, and in the meantime I found that he had blocked my best friend's facebook and cell number, who was my primary witness for the rape case. This just confirmed my earlier suspicions that I had before filing charges that he might have been stalking me, because he had never met my best friend nor had I ever said her name. There is absolutely no connection. I wanted to go to the police with this new information but my best friend was horrified so I didn't. I stopped trying to get information out of my rapist about it as well. A week after I stopped, I got a letter from his attorney saying that if I try to communicate with him again they will have to go to the authorities. I decided then that I'd have to go to the police with what I found, but the problem is when I asked my friend to check to make sure he had her still blocked, it turns out he had unblocked her. I'm pretty much back to where I started with no concrete evidence. Should I still tell the police? What else can I do?