My neighbor has been looking in my windows for about 2 years.?

He has also been walking around the neighborhood so I ume he's widened his area. I caught him three times so I told his girlfriend. She tossed him out. Is he dangerous? I've been told they progress into rapists. I also wonder if he will retaliate for me telling her about it. I have had the police out when I didn't know it was him. Should I tell them who it is? Why would he want to see an old overweight lady when he has an attractive young woman at home in bed? Will he be able to stop now that it has humiliated him? I know he is embared because he would take off for the house when ever I came out. I actually feel sorry for him as well as her because they were going to try to have a baby and have been together for years. The baby issue is what got me to tell. I just couldn't let her have a child with him having such a huge secret issue she knew nothing about. Please give me your opinion.