“I heard a pastor make that argument as to why God is no longer married to Israel.”
I think the church we go to — “Covenant” or “Reformed” or similar — thinks that Jews no longer are God’s chosen people. Now it’s the Church. No chapter and verse to support that, though.
That's also Catholic, Orthodox and much of mainline Protestant theology.
John 1:12, Romans 8:14-17, 1 John 3:1-2, Galatians 4:6-7, and some other verses are what are foundational to that belief.