AIO for cutting ties with my best friend after getting to know she's a gold digger & cheater

Hii. I am (21,F) and my ex best friend same age as mine. Let's call her Mia. So, we were swore enemies back in school days. But our friendship got better after we both got into same college. We used to go to college together, hangout and eventually became besties. I really loved her so much. I usually emotionally supported her, during her relationship ups and downs. She always played victim, i really never thought that much , because I trusted her blindly. She always told me how her bf(28,M) is hurting her and made him villain. I tried my best to support her. So,her bf was her tutor and he has been tutoring her for 5 years. They have a significant gap between their family background. He comes from a lower income family which really never bothered me because the guy is very smart, well mannered and hard working. He supports his full family without having a proper job. On 2025, he completed his master's and was looking for government job and was studying his a*s off to secure a good job in order to marry her. During that time he was going through hardship and they had a really hard time. But she portrayed him as a villain in front of me. Until I took the initiative to go and talked to him directly about this. I saw the voicemail and everything, and get to know how she treated him so badly. Even in an argument she told about how low class family he has. After that, i tried to talked to her about all of this she was doing, to give her a self reflection. But that didn't go well. So i started distancing myself. She has this habit about bitching about one friend to another friend. She always tries to grab center of attention and have the kind of pick me girl behaviour and always tries to drag others down to show she is the best.( I realised all of these traits later guys, i am sorry for my blindness). Then I moved on, but still was in touch with her ,not like before tho. Their relationship was okay, her bf secured a good job in a bank and immediately proposed to marry her. She denied because she just gotten into university, she just want to enjoy. He was making up to her , showing efforts by all the love languages ever exist. Then few days ago i got to know from a friend of mine that they broke up. The reason she is giving that their family status doesn't match and he is not enough good looking to be with him.She even got a new bf who's rich enough to maintain her rich life style and he has to look after his poor family which will make her life difficult.Omg the audacity. She even hooked up with a guy friend from her university and didn't even tell him while they were in a relationship.I was so sick of these, i immediately unfriend her from everywhere and ended the friendship. I was like how could a human being do this. Having her in my friend list was disgraceful for me. My other friends told me i shouldn't have ruined a friendship over this, but this was too much for me. Calling her a friend with such a negative and narrow mindset is a disgrace for me. So did I really overreacted? All of my friends are telling me, i overreacted.