AITA for telling someone to mind their own business?

A while ago, one of my close friends (will address as B) came back to school to visit around my birthday, my ex-friend (A) (we were quite good friends 3 years before, but she decided she wanted to hang out with "cooler" people and started ignoring me) knew that we were on very good terms - classic teenage drama though, we were close but didn't want to be THAT close. Anyways A and one of her "cool" friends (P) decided to corner B and ask if he got me flowers and whatnot. I didn't know anything about this until (B) texted me afterwards and told me about it. I was pretty shocked so I confronted A and P about it the next day, asking why they did that. They told me they were just trying to help. Help what? I was pretty angry about it so I told them to stay out of my business / stop sticking their nose into my business, like straight to their face. At that point I was just so done because A is one of those people who just loves to get the tea on other people - iykyk. I'm pretty sure they held that against me after that. The day after that, A and P just happened to be there while I was going to my locker. The hallway was dead silent, not a single person there. So naturally my attention turned to what they were talking about - which was someone else's business, had absolutely nothing to do with them. I gave them a sideeye, and they were like "we're not talking about you, don't worry". I was kind of like, why would I be worried that you're talking about me... I've met enough of people like them to know that usually their lives are just incredibly boring so they jump on the first interesting thing. They then proceeded to jokingly say "don't stick your nose into other people's business", clearly a dig at what I said the other day. I was confused after that, because like, I'm just curious why you're AGAIN involving yourself in someone else's business, much worse you're gossiping about someone? I don't think I'm getting in their business if it wasn't their business to begin with? AITA?