One tire

Working from home and walking to stores, I don’t drive my car much.
After three and a half years, less than ten thousand miles.
As little as I drive, I still ran over a nail and had to get a new tire.
I figured I might as well buy 4 new tires, but the store owner insisted I just needed the one.
Okay, fine. Thanks.
A week later, I hit a pothole too quickly and tore up another tire.
And I needed a tow to the tire shop.
He’s still only selling me one tire.
At a time, I worry.