My guess Tony and some of his family got killed in that diner. For a guy that likes good food. What's he doing in a diner?

Tony killed Leotardo in front of his wife with his grand children in the car.

Phil's under boss had no respect for Tony. He used Tony to get rid of Phil. Then he got rid of Tony when he became a boss. Plus he did not like tony putting a gun to his face. After all to NY all Tony was the head of a glorified crew not a boss of a family.