Why would my ex ask for permission to add a guy she used to have feelings for on her fb?

So my ex broke up with me a week ago, and tbf it was cause I didn't trust her due to my own past self traumas with cheating ex's, and also being an anxious attachment style, after she ended it I went into no contact and self reflected and realised I was the problem in this relationship as she literally was awesome, and I had no reasons to doubt her, anyways I deleted all her contact details and she randomly messaged me a week later to ask If she can add a guy she used to have feelings for, I told her it's her life she can and I hope they work out well, I also said how I realised how I messed up bad but I accept the life lesson and hope she has a nice life with him, but she then tells me I have nothing to worry about and it's strictly platonic so yeah just confused why even want my permission as i am completely out of her life now and why try to even reassure me she won't be dating him at all

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Ah so turns out she liked him but blocked him so he never saw she was taken with me, and now she's single adds him back, so she was definitely protecting him from seeing her give her love to me, well I told her If she ever wanted to me with me I need to see what he looks like and I'd want him to see she was mine and I'd be hers, but yeah maybe she was trying to make me jealous but she was the one that ended it but seems like she's open to trying. Well I've set my boundaries we'll see
Why would my ex ask for permission to add a guy she used to have feelings for on her fb?
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