AITH for not telling my guy bestfriend's girlfriend about his female friends?
so little bit backstory, me (19f) nd my guy bsf, (18m, lets name him martin) went to the same school. We knew each other but never really talked. After 10th grade, i changed schools and got into this new friend group in which eventually he also joined. We got closer and became best friends. Martin then told me about this girl(around 18, nancy) that has liked him from 3 years, who used to be our junior. He denied having feelings for her, but also wanted to see how it goes with her. Last year, 2025, around march, i got into a relationship, after around 3-4 days, martin called me and asked me about nancy nd that he was thinking about dating her. I was really excited for him and told him to go forward with it. They both got into a relationship. and nancy nd i were also on good terms. Now this is where things started to get messy, nancy knew that martin had female friends, around 3-4. She told him to not make any female friends in college. Martin and i went to separate colleges and were in touch. After around a month, martin told me about how he had made new friends, they had made a whole group etc, nd he also told me there were some girls in it too and how he was friends with them too. and i asked him does his gf know? he denied, nd to which i said that you should tell your gf about it. He told me that he will, but he didnt. Over the course of 6 months, he would tell me about these girls and stories about them, sometimes i would listen, i told him multiple times to tell his girlfriend about it so that she doesnt get upset over it. and not only on chat, but sometimes we friends would hang out, and even his other friends would tell him about this. so about two months ago, nancy got his instagram id, and she read my chats with martin, and got to know about these female friends that he had made in college. She blocked me from his account and then messaged me on whatsapp saying that she has blocked me and blamed me for not telling her about this before. I told her that it was not my place to tell her, and that i had told him multiple times to tell you about it. She was angry that martin told me things that he didnt feel comfortable telling her about, im not talking about female friends but rather his own personal things, which as a girl i totally get that you would want to know about it as a gf. but idk if i shouldve told her about this? i felt it wasnt my place and he as her boyfriend shouldve been the one to talk about this with her.