Stalker. I don't even run into my next door neighbor 5 times in two weeks. That's way too much. I would suggest notifying the police as well, so they at least have a record of it.

Also I'd lay low for a while as in not go to my regular places for a while or try a new route.

Having a dog is nice too. The big ones may defend you and even the little yappy ones like the one I own will notify you if someone comes close your house. I wish you well.