Strange incident

So it happened to me the other day. I drove on a normal country road so 80 km/h (I just had to go pee). And once an Audi popped up from behind and got pretty close to me. Then I drove a little bit slower so that he could drive by and I could drive in somewhere to pee on the right. Well, he still didn’t drive by. At once the one goes like crazy past me (went downhill and it was winding rich )) And started to slow me down. On the track, a curve (right strong) came through which he drove quite slowly (turn went to the right) I was then left in the field path wanted to stop my car. I saw that the one behind the curve then stopped for whatever reason I didn’t know it. And since it was dark I didn’t have to worry about it either and ran straight back into the car and drove into another direction because I was following The guy with the AUDi had turned straight around and had driven behind me who had literally followed me. Then I looked at SPiegel and had seen it in the Audi behind me twice lightnings thinking there were policemen in Zieviel but just continued driving because no red script lit up. After a few meters he drove into a small rest place and turned again and ran away. In the next 48 hours after that there was also no police behind me what could that have been??