Our expert says:
Unless he's extremely rich, one wonders what the kid of 25 is wanting from him. Maybe as you imply, she seeks older married men for her afffairs, and helps them to delude themselves that they are somehow irresistable in themselves, just at a time in their lives when they're feeling very resistable.
I suspect he is thinking of himself, and not with the intelligent parts of his brain, and not intentionally doing anything actually meant to hurt you ( though obviously, it does ). You don't compete with the irresponsible kid, and shouldn't need to.
Sounds like she has insufficient actual intelligence and skills to believe she can succed in life or business on her own actual work, and wants to sleep her way to the top. She will, as you correctly say, drop him as soon as there's nothing in it for her, and ultimately she will sleep her way back to the bottom again.
Look after your own best interests, and noever concede anything as regards your own financial and other security or that of the children. Try to persuade him that he needs to join you in marriage counselling ASAP, and to prepare himself for when she drops him, as she has presumably dropped all the other men she has climbed over.
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