Sometimes when you go through something like that, people want the attention, as well. I know it's not the best attention to crave for, but people still do it. I had a friend who faked a miscarriage and then an abortion, and she was never pregnant to begin with. She does sleep around a lot and has gotten an STD twice, but her parents aren't really much of parents to her. She ALWAYS wants attention from people. Honestly, if this girl bothers you then don't stay friends with her. I do believe in second chances, but you just simply can't trust liars. You need to surround yourself with people you can trust to be true to you and themselves.