I’m friends with my crush (?) and her ex, what to do? ;(

THIS IS A REALLLYYY LONG RANT BUT I NEED HELP - I was listening to Paramore but I can’t really listen to them normally because the girl I like (PersonA) has an ex (PersonB) who loves Paramore, and the problem is that her ex (PersonB) and I are kind of friends, ANOTHER PROBLEM is that the girl that I like (PersonA) is also kind of my friend ??

Basically how we kind of know each other is because my friend (PersonC) introduced me to PersonB around last year and at the time, her and PersonA were on a on-and-off relationship throughout the year. I, however, didn’t know that PersonA was with(?) PersonB until much later on. It felt wrong for me to crush on her because me and PersonB were getting along and stuff. Not that long ago however, both PersonA and PersonB “mutually” agreed to break up. I say it’s bullshit cuz PersonB still talks about her on her socials.

PersonA and me began talking cuz my friend always talks to her and brings her near our group, the thing is both of them (A and B) are in the same class so whenever PersonA is close, PersonB is closed off to us.

And also I’m sure— I don’t want to sound egotistical— but I’m sure that PersonA likes me too because whenever we talk, she gets super red and fidgety, always stares my way and in general is kinda obvious. But I can’t help but feel like the only reason why she does is because I remind her of her ex.

Me and her ex both like Paramore, we both are weird in our own way, we both like drawing, and we always get mixed up by other close friends. Idk what to do :(( Sidenote: I hate the fact that I can’t listen to Paramorw normally because of PersonB, it just makes me feel like I have a grudge. It’s like when someone gets into a fandom you like and you don’t like the feeling, idk if that makes sense.

Other than that, back to my main question, Idk if I should continue with this crushing. I probably will, we’ll see how far it goes. Probably not far lololollll