My stepbrother and I have a very bad relationship. I don't want to go into details, but please understand I did cause some of the conflicts, and that it is not an entirely one sided ordeal. But basically, my stepbrother is extraordinarily hateful towards me, and has gone out of his way to act very childish towards me. The cause for this is that around 2 years ago, I used to be a massive bitch, essentially. I was the entitled, gossiping, bitchy sister who acted very narcissistic. I lost all my friends and realized it was my fault. Since then I have had a wake up call and since changed my behaviors radically.

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But, my brother refuses to see that I've changed, and I don't know why. I've made peace with those I've wronged. I've apologized sincerely and made amends to anyone I hurt. But, despite it being years later, he goes out of his way to gossip and spread rumors about me that aren't true. For example, when I quit my job as a stocker at Walmart, half the town believed it was because they caught me using drugs due to him gossiping and lying about the real reason I quit, which was to upkeep my grades in school, since they were failing.

Nonetheless, Ive decided to share no mutual friends with him. My friend, who I'll call X, by some chance, have a class with my brother. About X, I want to be very clear I have no problems with her behavior, just not when it's with my stepbrother, who I have a bad relationship with. She catches feelings extremely easy and sleeps around quite a lot, especially if she likes the guy. I don't care and remind her always to be safe because she can be careless about it, i.e. not wearing condoms. I just don't want her to do it with my stepbrother.

I told her of my past with him and explained that I do not care if she talks to him in the class, but if she befriends him, then I'll exit myself out of the picture because of the rule. I don't want to control who she's friends with (this is the only thing I ever threatened to end our friendship over) and that It's entirely her choice.

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Because I said I don't care if she talks to him in the class, within a week, she took that as a green light and has a crush on him, sleeping with him, and going to partying with him.

I cut her off and now her sister is calling me an asshole, and she's telling everyone I said it was okay and that I'm just a controlling bitch. BTW, she was my date to prom, and I'm getting called an asshole because I cancelled on her a week before prom, and that I was being controlling and jealous.

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AITA?

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TL;DR Me and my brothers relationship is rocky, and I have a rule to not share mutual friends. My prom date, also best friend, has a class with him, I told her I don't care if they talk in that class, just don't become friends. Within a week she's his friend, sleeping with him, and partying with him. I ended the friendship with her a week before prom and now I'm being called the asshole by her sister. AITA?