First, sorry you are going through this..
Second, sounds like you have done this, but be clear that he is scaring you and you want space and privacy. There are plenty of other options for him and it would be best to part ways. If he does not listen then you will get a lawyer and obtain a restraining order and report him to authorities. (Did you hear about the lady who was just awarded a big settlement in a stalking and outing case in Colorado?) Maybe even Google it and reference it. If this does
Not work..
Third, out him, black list him, share his name and contact numbers and emails.and names on the ladies only sites, black list him. You should probably do this anyway. He needs to know that you and others do not approve of his behavior.
Fourth, may need to consider your screening process and shore it up. Some ladies go through a name/branding change too, it's a pain in the ass, but might be worth it.
You said he drives past...does he know where you live because you host there or because he found out by being nosey and disrespecting your privacy? If you host at home I would encourage you to stop. If You rent, can you move? It's a hardship, but you are more important!
Anyway, just my two cents. Peace and best of wishes to you.