Ken is also a huge fan of collectible card games.
By the time you get home, he's less excited. You've played these games with him some. They're not quite your cup of tea, but you enjoy the time with him. You're expecting him to share all the details, and maybe to open the box with you. Instead, he says he's tired and feels a bit bad, and he goes to his room.
Maybe an hour later, he comes back out. He asks to speak to you, so you turn off the TV and give him your attention.
He really did do pretty good today, but he only won because he cheated. Now he feels really miserable and really guilty.
What can you do to help him deal with it?