Sand and gravel probably did hit the cars. It’s totally not a big deal. If you have a pristine vintage car, driving around VT in the winter is not a great move.

So it sounds like the plow guy did exactly what one would want and expect. He touched up the driveway, he didn’t encroach on the area where cars were parked, and he caused no damage. He had no control over the car being where it was but it didn’t matter because the car wasn’t damaged.

Your bf sounds like a pill and I have to wonder how he behaves in other aspects of life. Consider for example how he’s going to be when your 3-year-old doesn’t put his toys away “correctly,” if you were to have kids with him.