AITA for ignoring my friend after she told my crush I liked him (sorry if this is a little childish, but I need answers)

Me (f, teenager) and my friends are kind of the outcasts at school. One of us, let’s call him Oliver (m, teenager), has been the punchbag for the boys in our grade for over two years now. I’ve also been bullied, and so have a few of my friends. A while ago, something happened that just broke my trust completely.

So, I used to joke a lot about having a crush on this boy, Nathan (m, teenager), when he wasn’t around. I even kind of pretended to like him more than I did at first, just to joke around with my friends. But eventually, after all that pretending… I think I actually started liking him a little.

There’s this girl in our group — let’s call her Ivy (f, teenager). She’s a bit more popular than us and spends a lot of time with the "cool kids." One day during recess, me, Oliver, and a few others were playing together when Nathan and his friend Noah (m, teenager) came over and said that Ivy had told Nathan that I liked him. Right after that, Ivy came walking over from the same direction, crying, and told me she hadn’t said anything, that they were lying and trying to mess with me. I believed her and told the boys that I didn’t think she said anything.

The next day in math class, Ivy asked if we could go to the library to work (we sometimes get to do special assignments together). While we were there, she admitted to me that she had actually told them. She said she felt guilty. She told me that when she was hanging out with the popular kids, Noah and Nathan asked her who liked Nathan. She said she knew about three girls. One had already admitted it. The second, she said, had too much beef with her to be named (I’ve also had many fights with Ivy before, so this hurt). And then… she named me.

She said they threatened her, saying that if she didn’t tell, they’d reveal her secret to the whole school. (Still don’t know how they knew — I didn’t even know she had a secret, even though I told her everything.)

This wasn’t the first time Ivy betrayed us. About six months earlier, Oliver sent her a fake message where he listed names of people he pretended to like, just to test her loyalty. A week later, we had swimming class, and I went outside for air. I saw Ivy standing right in front of Noah and Nathan, reading that exact list out loud. Oliver has been bullied even more ever since.

More recently, a friend from our group (f, teenager) returned after being abroad for a whole year. Ivy immediately started clinging to her, trying to get her all to herself. That friend and another girl from our group started ignoring me — I think because I was ignoring Ivy at the time. But when I eventually forgave Ivy, they stopped ignoring me too.

Some of the more popular girls (they’re not that mean, actually) told me that Ivy was pressured into telling Nathan. I replied, “If she was being pressured, and you were there, why didn’t you help her get out of the situation?”

It still stings. And even though Noah and Nathan never bullied me about the whole crush thing (thankfully), I feel really hurt and left out. I’ve heard (and seen) that they have a secret “BFFs of the class” group chat, and even though I thought we were all a friend group, it’s clear I’m not included. It makes me feel even more forgotten.

So… AITA for pulling away from Ivy and needing space after all of this?