Our expert says:
Youre surely right, ~Wings, that this is not at all about maturity or immaturity. She is being simply thoughtless and selfish and not considering either of you at all. And when she speaks of cutting ties, she is placing this opportunistic Ex above her own child, which is not at all wholesome. I don't think he'll lose his mom over this, in the end. She is trying to manipulate you, and if you two stand firm, she'll revise her decisions. And she is likely to find the Ex not so angelic when living fulltime with her.
As Buzz says, make it clear that she will remain very welcome in your home., if she visits on her own.
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