The shy girls or ones who don't show drama outside, are very dramatic inside a close group or at home.
I have always seen it with friends in my family and girlfriends. One girl broke up with me as I don't like or create any drama. She used to throw so many tantrums and call herself moody. But I generally have a high tolerance and am calm in bad situations. Her exact words were, she hates me as I don't get angry and say stuff as she does.