What does it mean if a guy jokingly says you're "hard work"?

What does it mean if a guy calls you "hard work", although said jokingly? They're someone I'm interested in, and we were flirting and I kissed him a few times the night he said that as well.

I'm wondering if it's a good thing or bad? Or if it means they're looking for something/someone a bit 'easier'? If you said this to someone, what would you mean behind it?

(I thought I was being friendly and easy-going that night, and the only "difficulty" I can think of is when I said I didn't want to go back to his place cause I don't know him that well yet..He still wants to meet up again, but I'm unsure what he meant)
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A few people said it's a flirty thing to say, but I don't really understand that. In my eyes, he was calling me difficult. I know (like you've said) I'm probably over thinking it, but can any one explain the flirty interpretation of it :S ha ha thanks :)
What does it mean if a guy jokingly says you're "hard work"?
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