Was it wrong

My brother got married almost a year ago. Before then his now wife was amazing. I was so happy to be getting a sister which I never had. She would make me things, we would go out all together, she wrote me such a sweet sentiment in a book she gave me by my favorite author etc… it seems as though as soon as my brother proposed to her she did a 360 and changed. She did not include me or hardly any of our family in the wedding planning. Only her family was part of everything. When I often made happy comments such as “ I’m so happy to be gaining a sister” she would not like the comment, reply or say anything. There were lots of times she ignored my text messages to her. We all stopped doing fun things together. Aside from that the marriage is not going great. I believe she emotionally abuses my brother and I also believe she thinks she is better than him because she holds a degree and my brother does not. My brother is the sweetest thing ever. He brought her flowers one time just as an I Love you and she did not appreciate them. In all honestly I think she is mean to him. There is so much to this story that I will include in a later post but I recently cut ties and removed her from all my social media. That’s triggered even more but I’ll save that for another time. I honestly miss who she used to be prior to marriage. But I guess my question is that… I am not wrong for cutting ties correct and removing her from my social medias?