[ in response a person breaking up.with someone for constantly accusing them of cheating, sending death threats to all their friends and demanding them to cut ties with their friends ]
It sounds you don't know to deal with her. Example: Instead of spending your time with your friends, spend the time with her, let her enjoy being with you no matter what the consequences are. Soon after, invite her with you and other friends and have fun, there is a chance of creating a trust with your friends and therefore she would trust you being with them, but that doesn't mean you have to stop. An honestly, it's kinda your fault. You know she isn't normal, that's why you should've given more effort with being with her. Take me for example, I have a shy obsessed girl (kinda yandere) who didn't talk to anyone expect me. Soon after I helped her being normal, invited some friends and soon after, she had friends. With a Yandere, you main goal is to end up in a relationship, but not a normal one, with much more efforts than normal.
Yeah, I did. I blew off my friends when they wanted to hang out, told her how much she meant to me, did whatever I thought I could to ease her paranoia, short of actually cutting those friends out of my life. But still, she got mad if I ever took time to hang out with friends. Or hell, she’d ramble on about how much she hated them even when I did blow them off for her. Obviously I knew I couldn’t handle this like I would any other person, and that’s kinda why I decided to go ahead with it anyway, but that still didn’t work. I mean, I probably could’ve handled it better, I know that, but somehow I still don’t think I could’ve made it workDon't say "I still don't think I could've made it work". If she is Yandere, than you play the yandere. Yep, you and her would have the same goal, try to bring yourself being a Yandere. I am not saying be mega crazy, I only say do the same thing so she would be happy. In other words, be the yandere. She would know how much she means to you, and how you means to her, making it a happy ending. There are also many ideas, but these ideals need a lot of effort. If you think you did your best, than you are wrong, give it more, go above your limits for her. Through hard work you get the best results. I for example had to give up my free time in October (Almost 5 hours daily) for her, just be happy and make her better for society. Try to learn from your lesson for the future.