Obssesed with my bf ex who is obssesed with me

So, i meet him 8 month before we began a relationship, we were friends or whatever we were, i never heard of her till lets say 4 month after i met him. She was stalking me via tiktok. I had that thing on on tiktok where u can see who watches ur porfile, and since i did not recognize the name, i also watched her porfile, her insta and her facebook and they were friends on the last one, mind u I wasnt friends with him on any of these. So I decided to send him an screenshoot asking “who is this girl, shes been watching my tiktok for a while, do u know her?” I already knew the answer, i knew he knew her, however she seemed more like a friend to me than a girlfriend, he’s former friend (a girl as well) seemed more like his gf or ex. Anyway I knew he knew her and i just wanted to know how honest he was. He answer her name is … and she’s a friend. I accepted this as an answer, but there was something of anyway even if she was just he’s friend she was creating an obssesion with me, a fixiation, and I knew she was headover heels for him. Two months of her stalking me every fucking day and me trying not to paying it mind, i met her. His father had given them both a ride (mind u they still live on the same neighborhood) and she was there sitting on our university lounge, but i didnt recognizer that time either i just saw a pink haired girl with a dress sitting a sitaway from him and him talking to one of our college friends, so i sat between them (i swear to god i did not know it was her), like two minutes after she stands up and says “im leaving” and kisses him on the chick and in that moment i knew who she was and i knew i did not like her. I, being the jelous bitch i am, said “wow” to him and left it at that. Later that day he told me she was his ex and they were friends now, and thats where it all began. I started to see her porfile more often than she did mine, and i stared to compare myself even more when i was right and she rejected a guy and went imediatly to tell my then newly bf she was still in love with him. My bf who care for her (they dated for like 4 years) told her that he had moved on since she had cheated on him (a year or so before me), and he was happy now and that she should do the same and give that guy a chance, she asked to keep in contact with him but he said no and blocked her from the chat app we use at my country. A month or so after that she posted a pic with the guy she rejected and we thought that was the end of her trying to get back to him. (during all this time i became more and more obssesed with her, even after they cut contact). I was wrong. She was always trying to be near him and began a friendship with one of my bfs neighbors and long time bestfriend (male) and was always (i am not kidding) ALWAYS at that friends house till late at night and some times she even rang the dorbell at my bfs house (hence that did not help with my obvious insecurities and trust issues) and as that did not work out, she began saying that they had been sleeping toegether, that i texted her and threathen her (i was a shadow stalker but i did not was that insane) and told her a million things, se said they were out to eat and watched a movie and i knew this chick was completly insane since she said all of this happened in two weeks we were out of the city and for obvious romantic reasons staying toegether day and night. Even with that i fucking could not stop comparing or get my fucking brain to stop saying she was better than me even in career choices. But the after a year and a half of daiting my boyfriend she texted him from another number saying a bunch of things about me like “respectfully, she is fucking insane, and she is taxting me and i have proof”, do u know what the fucking proof was? She badmouthing me to all her friends an saying i followed her, i like her, i texted her and a bunch of more things i did not do. I got sick of this and i told her to fuck off from my bfs phone and he told her she sould really really stop trying to get his attention because it was getting fucking creepy and that she should check her self into a m,ental hospital. My sister texted her form insta as well telling hher to stop messing with me and my relationship (i forgot to tell that she told a friend we have in common that she was gonna do everything in hher power to end my relationship, in fornt of her fucking bf who apparently thinks that is normal) she the went to that same friend crying and told him that she hated me that she wished me dead and that she hopes we rot and we die of hunger and a bunch of other things like that. We all blocked her from anywhere (she blocked me on insta whith one of her accounts, i blocked her other one), we blocked her form anywhe, his friends, our common friends, but from time to time i feel insecure with her and i dont know why, i use a anonymus ig porfile watcher since she blocked me, and compare my self, everyone i have gone to does not understand, am i crazy???