So, I've been with my boyfriend (let's call him Jim) for about 4 months. Apparently this girl (let's call her Jennifer) has a huge crush on Jim. She is also one of Jim's good friends. The thing is, she is being very mean to me just because I'm dating Jim. I used to be Jennifer's friend too, but ever since I started going out with Jim, she started ignoring me, and now she is being mean to me. The first time she started being mean to me was 2 months ago. I was texting her and then we started talking about Jim. She asked me what Jim saw in me and I forgot what I answered back, but she said, "no offense but i think your ugly and jim is super cute tho y is he dating u n not me hes out of yur league no offense but im wayy prettier then u" That's what the text message said. I was so upset that I didn't even reply back. Now, she is being even meaner to me. Sometimes Jim, Jennifer, and I hang out. Whenever Jennifer and I are alone, she starts saying really mean things to me. She calls me names like a b****, a sl*t, a wh*re, a c*nt, ugly, etc. I wish she would just get over it. She even messaged me on Facebook telling me that she was going to kill me and slit my throat if I don't break up with Jim. I messaged her back saying that she needs to understand that Jim is taken by me and she needs to back off and stop threatening me and just get over it and find someone else to crush on that's not taken. And then she blocked me. So I blocked her on all my other social networks, too. The problem is that Jennifer and Jim are really close friends. As much as I hate Jennifer, I don't want to ruin her friendship with Jim. I don't want to tell Jim that Jennifer is threatening and bullying me. How can I get Jennifer to leave me alone? I can't ignore her because she always blows up my phone with mean messages and death threat messages. I'm also afraid to tell a guidance counselor or principal at my school because Jim might find out. How do I get her to back off and leave me alone?