“So God just keeps his covenant with you, but nor with Jews?”
God kept his covenant with the Jews through Jesus Christ. The consistent belief of Christians from the beginning has been that Christians are themselves the new Israel. Jerome made this point in the 300s, Augustine in the 400s, Aquinas a thousand years later. And many others.
The Church was founded by Jews, who remained Jewish. You replacmenttheilogy people spirtualize Israel’s promises. That is a lie.