Is this normal? My boyfriend meeting his ex and his ex being this friendly?

Hey, everyone, this could be a topic of discussion.

Recently my boyfriend's childhood best friend and her ex who shifted to states came to meet him and his friends after 5 years. I know her, as in when my boyfriend and I got into relationship he told me she cheated on him when they were 14 a week ago his birthday and broke up with him, as he shifted cities was not in good position to talk to due to personal problems. When we were in talking stage he told me all this and sent me her apology message which was really lengthy. She used to tell all the details about her personal and professional life to him and he used to tell me She came and she my boyfriend and another friend decided to stay in airbnb. On the day when they were gonna stay my boyfriend came to talk to me, are you okay with this? Honestly I was not as every friend of his knew he is gonna meet her and they were teasing him that he will have sex with her. I was furious that day it felt like it wasn't just wrong my senses were telling to stop him and the feeling was super strong. So we met and we decided he won't stay their. Then it happened so that my friends asked me to go meet her, show that yeah you are chill so I asked him and went and somehow I also stayed with them. 2 days after when she and that another guy went to their hometown to meet other friends, my boyfriend couldn't go he did not want to, she drunk called him and asked him to stay with her on call and telling I feel like puking and all when her other friends were their. I was super furious. She complimented me a lot when we met but I felt an off vibe from her. In airbnb I was the one who initiated the conversation, and their I watched them talking it felt like I did not belong in their world at all it felt so bad and after that drunk test. I hated her. When we came in relationship she congratulated him saying I am so happy for you sweetheart and all I felt off vibe from their only. Is it right of me to get furious?

Is this normal? My boyfriend meeting his ex and his ex being this friendly?
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