What does Malachi 2:11 mean?

Judah has been unfaithful. Something disgusting has happened in Israel and Jerusalem: Judah has disrespected the holy place God loves, and has married women who worship foreign gods. Malachi 2:11 - Modern Text Bible

(God points out that the people have broken faith by marrying those who don't share their commitment to Him, which undermines their relationship with God.)