How did Hinton learn that Lester was getting married, and why did he think that Lester did not tell him about his upcoming marriage?

When Hinton talked to his mother one day, she told him that she was cooking up a big dinner for Lester. They were celebrating because Lester got engaged. At first, Hinton was hurt that Lester did not tell him he was getting married. Then Hinton realized that Lester did not tell him because he did not want to hurt Hinton and have Hinton think about what he was missing.