Would you be upset or let it go?

A friend called this afternoon and asked to borrow my truck to move some furniture for his wife's friend. He told me she tried renting a truck and nothing was available. We live where hurricane Milton came ashore. Trucks are in high demand around here. I said sure. Then he told me that he and his wife would bring it back with a full tank of gas. They came over to get the truck and told me again that they would bring it back with a full tank and the lady they were moving the furniture for was paying for the gas. I said okay. In the past every time they borrow the truck they always say they will bring it back with a full tank and have only done it once. After they left I took the car and went to Monday night Men's Bible Study then out to dinner. As I was finishing dinner I get a text message. I just brought the truck back. The key is under the floor mat. I put $20 in the tank. Now, I have a 34 gallon gas tank and the truck was a little under half full. So it would take about $60 to fill the tank. I have no idea how many miles they put on it or how much gas they used. He told me twice he would fill the tank. My friend makes really good money and his wife does pretty good too. They could easily afford to fill the tank. Or as he said the lady they were moving the furniture for was paying to fill the tank in appreciation for using my truck. Would you be upset or just forget it?