HOLLA ON THE GO: Harassment while running

The last two times I have gone on my usual running route (at different times of the day) I have been passed by the same guy on a bicycle who has made me very uncomfortable, the first time he slowed right down as he went by me and stared at me nodding and smiling for 30-40s before cycling on when someone came. The second time there were more people around and he slowed down and waved at me. It made me extremely uncomfortable and no longer feel like running outside.