He said I’m hard work, what does this mean?

Me and a guy I have known years at work, have recently started dating. We recently had a minor argument (I started it for reasons I felt was valid) anyway, it didn’t blew over smoothly and we worked things out without a big deal made, but he mentioned I am hard work. What actually does this mean coming from a man?

He said I’m hard work, what does this mean?
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