My ex-boyfriends sister is psycho she won't stop emailing me saying cheated on him and that I never loved him! She keeps saying that I am going to end up pregnant and that I am a I don't know what to do it was hard enough to break up with my boyfriend because I love him but I wasn't happy anymore what should I do?

Delete all of the emails without reading them, or change your email address. If it is texting, you can block her phone number or change yours. You do not need to explain to her why you broke up.