Accident–no police

Hi people, I was at a party yesterday, picked up my girlfriend and went there together.I had to turn around again… so I turned around..at the same time an older man wanted to park out and put in the back water… I hopped then…he stopped for a short time and had enough space to drive forward…I thought he did that too..but then he drove on and I Hupte again…but there was already too late…then he caught me…then to the right and to the right d got out..the old man had almost a heart attack…full of trembling…his wife also meant immediately that she was guilty and she heard me several times horns…now watching was nothing at first..I didn’t get the green then….we only changed numbers.I was then looking again today..a pair of paint tracks…the rim got something and some things are riisen…from the wheelwheel stop…now I’m not so sure if it was right not to get the greens… I’ll call people later and tell them what is..but what do you mean???What am I supposed to do?But to the police???