Sorry I started to post this, and pressed create before I was ready!
For the past 10 years, someone that I was friends with has been harassing me and potentially stalking me. When we were friends I was in a relationship, he kept asking me to go to his house and didn't understand why I felt this was disrespectful to my partner, he also kept making comments about my body, so I eventually said to him that I didn't feel we could be friends anymore.
At this point, his behaviour completely switched. He started sending me abusive messages, about how I would never make it to my 60s, how amazing my breasts were and other vile stuff. I blocked him, updated my privacy settings but over the past 10 years he has made a multitude of different Facebook accounts which he messages me from, and then blocks me before I can block him. He then unblocks me a couple of months later, sends more messages and blocks again. I've even changed my name on Facebook to not my real name, and he still finds me.
I was out a few months ago, and noticed him watching me from across a road while I was waiting for a taxi. When he saw me looking, he ran down an alleyway. 5 minutes later he reappeared, and ran off again. He has sent me messages on multiple occasions asking if I had a nice time with my mum (when I have seen her that day) and commenting on my outfit, which leaves me to believe that he must be stalking me in real life. The messages he sends, he talks in third person about himself and how amazing he is, and how weird it is that I keep dating losers when I could have someone like him etc...
I have reported him to the police on 4 different occasions after I discovered that he has previously been to prison for stalking another young woman. He has also been sending messages to my mum, a friend that I used to go to school with and seems to know all of my exes. The police have said, that because he leaves a 3 month gap in-between communications with me, it's not enough to amount to harassment, and therefore there is nothing they can do as he hasn't sent me any direct threats.
Out of desperation, I sent a message to his sister (as she is the only person related to him that I know) and told her what has been happening. She apologised (I told her she didn't need to, it's not her fault!) and said that this isn't the first time that women have messaged her, her sisters or her mum about his behaviour, and that he has autism and she is sure he would never actually do anything to harm me.
But the truth is that I'm really scared, and the police have made it clear that there is nothing they will do. I don't know what to do anymore, and would really appreciate any advice.