My ex-gf/best friend ruined girls for me

Once upon a time there was me, a random girl who just discovered tumblr. Naturally since EVERYONE on tumblr was LGBTQA whatever, I also started to question myself. Am i really a girl? Do i like girls?? What???
At that time i became best friends with this girl, I'll call her Bell. Bell seemd nice and funny etc etc. We were EXACTLY 100% the same.
Since it was the first time ever I got that much attention from someone + questioning my sexuality i fell for her. Bell really liked to flirt with everyone and everything, she was also very touchyfeely ALL THE TIME. At first it all seemed fine. But then it turned out she was EXTREMELY possesive. She'd start fights over me not sitting next to her at lunch?? She'd make drama over me making other friends. She said she absolutely HATED my new friends and constantly said i was replacing her. And then she'd suddenly become besties with all those friends she hated and also love everything they loved. Besides being possesive she was also very toxic. She'd point out all my insecurities all the time while SHE KNEW that hurt me. She'd constantly try to compete against me over how sad her childhood was, our drawing skills, grades, etc. She'd also brag about everything and act as if she was beter than me.

Anyway, i fell for her. And got rejected pretty badly. We stayed friends after that. Then after 2 years of constanly fighting and me being wussy and taking it things changed. My school fused with another school and our friendgroup changed. At first Bell was loved by all our friends in the group. But things ofcourse turned sour cuz she flirted with everyone and she created drama the whole time over nothing. Since she was constantly demanding attention from the guys and literally telling them to adress her as queen and acting all high and mighty, the girls really started to hate her. And since the guys were closer with those girls it became a fight between Bell and the group. Ofc i had to back her up all the way blablabla.
Now since no one liked her anymore she suddenly out of no where fell for me??? She kissed me and confessed and stuff. But we didn't start dating until she asked me via facebook (i knoooow).
Anyway, we weren't even one week together and she started flirting with some other guy blablabla and she dumped me via facebook (ofcourseeee). But this is not what ruined girls for me. It's what she did after that.

That week was hell ofcourse, since even tho i actually didn't like her anymore like i did waay before, I was still scared to lose her as my best friend. That week she also acted like the biggest bitch out there. Basically cyberbullying me all the time. Right after she dumped me she also started dating that other guy. Then after that week she tried to be all cuddly and friendly again and i was having non of that. Ofcourse since I was sick and tired of her, i went ahead and told the whole group what she did.
And turned the group against her, oops! That was not an accident (petty, i know)
Blablabla skip ahead. And then suddenly out of the blue, i saw the most beaut boi ever.
And for some reason i instantly fell for him.
Blablabla we started talking, Bell tried to get close again, went on a date with my beaut boi and we got together. It just felt right. And i was happy.

And this is where she completely ruined girls for me.

Bell was 10000% not happy. She acted all possesive again, as if i still was her girlfriend. She'd start drama again and again and again. She'd tell me to shut up about me and my boi cuz i was "rubbing in her face that im happy and she isn't". She'd go and try to turn the group against me (in the end she succeeded). She'd be like "stop (insert hobby we had in common), i also want peoole to notice me/my work!". She'd tell me i was fat and gaining weight. She did all this every single day for months. At some point i became depressed and my health was bad, she'd say stuff like "you dont deserve to be happy", "im better than you", something along the line of "kill urself" etc etc.

She wasn't a good person. And I'm glad i grew the balls to cut her off.
After that I just never felt attracted to girls ever again. Its like i got traumatised or something.
I still have a hard time trusting people, especially girls. But im doing a lot better now.

The last thing i wanne say is, if your friend or whatever does the same things as you read above^^ please dump their ass. Please don't waste your time and love on toxic people. You are worth more than that.