How can I cheer up my long distance boyfriend?

Something really bad happened to him, he still doesn't want to tell me, which is fine. I understand. He said he will tell me some time, which is why I need to be ready for the worst and be able to support him. But I suck at that :( Do you guys have any tips on how to make him feel better when the time comes?
How can I cheer up my long distance boyfriend?
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