Would it be wrong of me or unfair if I told my boyfriend not to be friends with the girl he used to have a crush on?

Anonymous
So when me and my boyfriend used to date about 7 months ago we broke up. But while we were together he always talked about this girl my brother said he had a crush on because my brother didn't know about us. He then told me that he was just pretending to have a crush on her to get my brother to not suspect us. We eventually ended things because he started dating someone else, not her. But then like not even a month after we broke up he wanted me back but he was still dating this other girl and I didn't want him back or I pretended not to. We started dating about a month ago and he's still friends with this one girl he used to have a crush on he says there's nothing to worry about but they walk to school together everyday. Not something he hides but he still says I have nothing to worry about and that he's over her and that she has a boyfriend Wich is true. But I am worried since we don't really talk that much at school but they do and like I even got mad that she tied his shoe laces. I'm scared that if she continues doing stuff like that he's gonna catch feelings for her if he doesn't already have feelings for her. What do I do. Do I tell him to pick me or her or would that just be crazy?
Would it be wrong of me or unfair if I told my boyfriend not to be friends with the girl he used to have a crush on?
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