Should I report it to the police..or what can I do?

I live in a city that has public parks opened until 11:00PM, I went for a late night jog at around 9:58, I was doing fine up until my third trip around the 1.2 mile park when I noticed a shady individual driving around the parking lot. He stopped as soon as he got near me (I was in the lower part of the trail and a parking lot is placed here) I looked at him and proceeded. About 5 minutes later he parks his truck and looks in my direction, I jog with anticipation, about 2 minutes later he is about 50 feet away from me, I panic and pick up my speed to get close to the busy intersection 100 feet ahead of me, as I approach this heavy traffic area he turns around and heads back to the parking lot. I breathe in relief. About 20 minutes later I reach the lower parking lot where I happened to have parked, I see no sign of him, I proceed to get in my car, and about 1 mile into the road I notice a set of headlights catching up to me really fast. I come to a 4 way stop and hear aggressive honking beside me, I look and it is the truck of the shady individual that followed me in the park. I floor it until the red light ahead, he floors it too and get's there before I. I noticed that he makes a left turn(I was also going to make a left turn to go to my house, but decide to go straight, as fast as I could). Is this suspicious evidence enough to have called the police, and is there something I can do now, because I didn't have my phone on me I didn't call ASAP, but now that I am home what should I do?