From a friend perspective do you think it's cool for your best friend to allow your ex to move in with them?

My boyfriend and I of many years ended on kinda bad terms. She allowed him to move in with her, but then saw no issue in it. I feel really upset about the matter because I can't even go over to my best friends house, but she still believes there is no problem with it. Am I being idiotic? I know she is able to do whatever she wants but I just don't believe it's a "friend" thing to do?

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