Help. Why doesn't my boyfriend laugh at my jokes :( ?

I don't think my boyfriend thinks I'm funny. He doesn't really laugh when I try to tell jokes or something, maybe just a chuckle or something like that. Sometimes he'll laugh when I'm not even purposely trying to be funny.

What I'm saying is, the way he laughs at a funny part in a movie or when he's with his friends isn't really the same with me. He makes me laugh all the time though. He'll dance infront of me or do something silly and I just crack up.
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I've asked him before and he says he does think I'm funny or that I do make him laugh. But I don't feel like that's true
Help. Why doesn't my boyfriend laugh at my jokes :( ?
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