I think my crush likes my best friend!

Last weekend I was at my best friend's house for a sleepover, we are going to call her Ava. Now Ava knows that I have had a crush on this guy in our school for a while. She is also together with his best friend. My crush will be called Peter and her boyfriend Ben. We four have been friends for a while and I actually talked about them in my first post.

Anyways at the sleepover we got into a bit of a deep talk and Ava decided to tell me that Peter knows I have a crush on him. She told me how her boyfriend(he knows I like Peter) had been asking Peter about me and Peter told him that he knew. Something which shocked me, because she didn't tell me when this convo was. So he could have known the whole time and not done anything. She also told me how she didn't tell me before because Ben told her not to. I was so pissed because how can you not tell your BEST FRIEND something this important. She has been cheering me on knowing he won't like me back. Like who keeps a girl in the dark like that.

Not just that but recently Ben started getting more cold towards her and know that is all that she is talking about. I literally have not had a conversation with her from the past days where she hasn't talked about how cold Ben is. Not that it's something wrong with that, but she literally does nothing to help the relationship. instead she spends more time with Peter and is all up in his space, because her boyfriend won't give her the attention. And it is starting to get really clear to me how there is something between them. Knowing that she had a crush on him before it all makes sense. 

if you have read the first part she asked to sit on Peters lap in-front of her boyfriend. She has Peter, her and Ben on her background(I'm not included even tho they say its us four) and whenever I go into the classroom she is always beside him. It just really pisses me of not because I'm that jealous, Im kind of over Peter, but it is the fact that she doesn't care about my feelings and now I'm stuck with them for two weeks. I only have them and another guy in my class who actually wants to be with me. I have other friends in other classes, but when it's lessons I have to act like I like them. It's only like two weeks before summer and we all go in different schools, but it is still a pain. 

To be fair she has always been like this and I've just dealt with it, but right now I have to much on my plate and this is kind of the last straw. I might be overreacting but I'm just so tired of her. Like when I want to talk about something important to me she zones out, says she understands and change the subject. Like why do I have to listen to her when she can't even remember what I said?