Guy's Behavior

What does "you naughty girl" mean?

''u naughty girl ;)''.(winky face included) what does it mean when a guy says that to you
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This is what happened. I broke something of my ex's and I texted my guy friend(I like him but he doesn't know) and I was like ''lol I wanna break another one'' and he replied '' you naughty girl ;)''.(winky face included). By the way I'm not a goody goody or a pastors daughter or anything lol but I'm not a bad girl :)
What does "you naughty girl" mean?
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