aita for staying friends with my best friend’s ex boyfriend?

i (17f) have been friends with my girls for my whole life basically and last year i got really close to my best friend (16f). i introduced her to my guy friend (17m) who she had a pretty big crush on. i’m not gonna go into the details here, but they dated for some time and then broke up. during this time i was talking to his best friend (16m) and, as an avoidant attachment girl, this was the first time i actually felt something real for someone. i loved talking to him so much, we would use each other’s slang, i got so happy and excited whenever he texted me or whenever someone mentioned him in any context. he was the only person i could imagine an actual future with. even though i’ve talked to a lot of guys, this was the first time i actually liked someone to the point i wasn’t going to run from a relationship. peak period of life, when they were together and we were talking. but things started changing after one time we were out on a ‘double date’, and he was ignoring me the whole time. which was his thing, because he always ignored me in real life, but over text it really felt like we were something. anyways this time i had enough, my feelings did an 180 and i started being colder towards him because obviously i was mad at him for ignoring me. and soon after he stopped texting me (not immediately, but every time he did i was cold to him), i stopped texting him and whatever it was we had ended. now this left me broken for months. i tried moving on but genuinely couldn’t. i told everyone (my best friend too) i was over him after a few months to not seem pathetic. i’m still not over him, even though at this point we’re fully no contact (we weren’t, but every single time we talked it was super short and he’d leave me on seen, and now we haven’t talked at all for a month). but i can’t escape him which is driving me crazy. anyways, after my best friend and her boyfriend broke up i was there for her, as well as all the girls in the friend group. and not just us but also my ex situationship as well. after his best friend broke up with her, he started texting her and she says he ‘helped alot with getting over him’. anyways this was 5 months ago and to this day they’re still talking. now obviously i am hurt, because she’s my best friend and she’s texting the guy i was, maybe still am, in love with, and she knows exactly what i felt for him so she can’t play the ‘i thought he was just another guy to you’ card. she says they’re nothing more than friends and while i do believe that it doesn’t make it any easier. i would be somewhat okay with this if she STOPPED BRINGING HIM UP. like i will just be going about my day and she’ll text me ‘oh me and xx are talking and guess what he told me’ ‘did you know he does this’ ‘can you settle a debate for us’ ‘guess what he just told me’. I DO NOT WANT TO KNOW. if i’m going to ever get over him i need no contact. i don’t want you bringing him up every 5 minutes. i’m jealous, obviously, and i might still be in love with him. but okay whatever. i think the reason she is doing this is on purpose and it’s because i’m still friends with her ex. like we’ve been friends for 5 years, i can’t just drop him like that. and it’s not like he did something absolutely terrible, he broke up because he lost feelings. if he did something really bad to her i would drop him yes. but since he didn’t, i don’t see a reason to. the thing is i don’t talk about him with her, unless she asks, and if he talks shit about her i defend her and tell her what he said. i don’t agree with what he’s saying, but i don’t want to drop him and choose sides just because they broke up. am i the asshole for that? i’m trying to be respectful but what she’s doing to me is driving me insane. it’s not like me and him are best friends or anything more than friends god forbid, but since we live in the same part of town we go get a coffee from time to time. (not just the two of but also another guy who i’m closer to). i feel like she’s mad at me for that and is talking to my ex situationship as revenge. she didn’t know him before all this and it’s a completely different story. i don’t care if she talks to him as long as she keeps me out of it and i keep my no contact going. i genuinely don’t know who’s in the wrong here and it’s driving me crazy hearing her talk about him and bring him up every chance she gets.