Goldwater hated Reagan.
Goldwater may have been jealous of Reagan’s success. He endorsed Ford in the 1976 primaries. Goldwater can in many ways be called a “RINO” in sharp contrast to his 1964 campaign.
No, Goldwater heartily endorsed Reagan. I remember him saying at the Convention, from the podium, that if Reagan was not elected, the U.S. might not ever have another presidential election.
When he got older and married a liberal woman, he did flip to Liberalism to a certain extent.