Did I go to far with joking about leaving my husband?

It's been many years since I haven't done a single joke in my life. I did them when I was in my 20's but suck badly at it. For some reason hardly anyone would find them funny.

I was just joking about leaving him. It took nearly an hour to reassure it was just a joke. I'm here till death. Did I go too far with that? I was watching youtube pranks for a while and I just thought maybe I can pull one like that.

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He really thought I was serious about it. I wasn't. I was just trying to light the mood I guess and thought by the time I tell it's just a joke, we would laugh together. Neither he nor others found it funny.
Did I go to far with joking about leaving my husband?
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