Our expert says:
No, I don't think you are overreacting. While it is obviously his duty to provide some maintenance and support for his children, it sounds as if he is almost maintaining two households, one ( with his Ex and the kids ) at his expense, afforded because the other is run entirely at your expense. So even i you don't actually pay for the maintenance, by paying for everything else, you are enabling him to pay high maintenance, which perhaps he wouldn't otherwise be able to afford.
And he hardly even has the excuse for refusing to have a child with you, that he can't afford it, because you can.
No, this sounds like exploitation, and maybe you need to move towards asserting what you want and need, rather than letting the ex be in charge of that.
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