She isn't asking for permission, cause quite frankly, she doesn't need it (and neither would he if it were reversed). She is asking for his opinion. He should give it and leave it at that. She'll make a decision, hopefully, taking his thoughts into consideration. If she decides to let the friend stay there regardless of his feelings, then he needs to figure out how much that bothers him and whether he wants to move on or stay.
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-Elle-
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