I need to vent...my cousin is jealous of me

So I have a cousin who has gone through a lot of bad stuff with her bf. He cheated on her and hurt her for a long time. I was there for her throughout everything! I was trying my best to comfort her , support her & make sure she was okay. She started to treat me trash and take it out on me because she was so angry that it happened to her. So she pushed me away and I stopped talking to her for a few months. This year , we ended up talking about it and she opened up to me. So now her and her bf are not together anymore and I think she’s still angry that it didn’t work out for her. So when I saw her this week , she said that my bf would do the same thing to me , even though my bf has been so good to me and I love him with all my heart and he’s never shown signs of cheating. He makes me so happy and my relationship is healthy. But she said that to me that day and then yesterday she told him that he should go to a club alone without me. So I have a feeling that she is low key wishing that I get hurt like she did , so that I could feel what she felt. I feel very uneasy ever since she told me that because my intentions are never bad to anyone , but the fact that hers are ! I need to stay away from her again! I really don’t want anyone in my life who wishes me bad!! I’m so upset about it , but I feel like I can’t tell her or she’ll make a big deal like she does about everything!