Girls would you break up with a guy over this?

Well i told my girlfriend that my parents were really straight edge. But my dads a pothead and my moms an alcy and a pot head. So yea embarrassing. I figured she would never meet them so it wouldn't matter. But now i am starting to really like her and she wants to like become part of my family. And i am already kinda part of hers. So do you think she will be mad if the truth comes out? Will she dump me? And should i try to just keep it a secret?