My new girlfriends ex is unhinged and has been sending me multiple messages threatening violence, initially on FB (I blocked him) then via SMS, I've also blocked him, so nothing for a few days. I'm sure this isn't the end of it. I can handle myself, but this guy sounds unwell and dangerous. Initially I thought it was just some guy talking tough on the internet, but his level of anger is concerning, it's increasing and he sounds like he is more than willing to turn up at my house or place of work. What are my options?