Firstly, I apologize for grammar mistakes- English is not my first language.
I (22F) was best friends with Emma (22F) since 2016. I met her in an extra-curricular club and hit it off immediately. Our friendship was pretty decent throughout with some ups and downs in between. We drifted apart in 2018 when she changed the club and I got to know that she is badmouthing me at that another club via a friend who joined that same club. I confronted her about the same but she refused to accept it- I still don't know if she really did it or not but I accepted her apology and we moved forward.
While we were trying to mend our relationship, I received a call from her telling me that her then-boyfriend caught her red-handed lying and meeting another man and he left her stranded on the street and she had no one to call so she called me. I had lunch plans with my family but I dropped everything and rushed to help her (as I mentioned we were trying to mend our relationship). I helped her, talked to her boyfriend- told him she is definitely wrong but still I need to stand with her as she is my friend- helped her get out of that toxic relationship (as mentioned by her) and helped her get over that as well. Over the period of time our relationship got better and we went on trips and had fun

Recently, there was a famous concert happening in City A and she wanted to attend that. She asked me if I wanted to attend it together but because of work reasons, I could not attend it. She seemed okay with it and made plans with other friends to attend that. She could not get tickets for City A so she made plans to attend in City B. My boyfriend lives in City B and we don't get to see each other often- last time I met him was 8-9 months ago. Me and Emma had discussed multiple times that I would like to meet my boyfriend and go to his city at least once as he is the one who visits me generally and I feel bad that I can't go (I am younger to him and he is financially stronger and he doesn't complain once that he has to come every time or I should come and so on. ) Emma didn't mention once that she is going to that city for concert (I didn't know that the venue of concert has changed) and she casually mentioned this when we were out for dinner with another friend- she asked if had any recommendations for that city's tour or food as she will be visiting City B for 3-4 days for concert and will also stay there and tour the city.

I was very disappointed in her and angry and I told her right there that she should have thought about me while planning a trip to City B as she knew how keenly I wanted to visit my boyfriend. She just said that it skipped my mind and she had already planned everything with her friends. Her response was very cold and didn't feel like she genuinely cared. I had bad experiences with friends in the past and I don't let anyone close to me- she was one of the few people I genuinely thought is my friend.

AITA for wanting to end friendship?