Why I am not funny anymore?

I am not a person who jokes all the time or looking after the moments I can joke but when I joke most of the time people laugh... I have a friend for 10 years but for the last three years I can see him only 1 time in a year. Last week he was in my city so we hanged out and whatever I say he didn't understand and ask me why I said it but they were some humor you know. Everytime I explained but I felt like there is something wrong with me. He moved to Germany last year. I thought maybe his humor has changed, but just in a year? Also, we have another friend who joined us when he was here. And she was like that too towards my humor. I feel like I am not funny anymore.

Why I am not funny anymore?
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