Is the husband's saying to his wife "So be it" after her saying, "I curse you, may God ruin your house," considered a divorce if repeated twice?

The husband's denial that a divorce has occurred does not make it so. The wife must fear Allah, treat her husband well, and not invoke curses upon him, as the Prophet (peace and blessings of Allah be upon him) forbade invoking curses upon oneself, one's children, or one's wealth.