What does Deuteronomy 28:30 mean?

You’ll get engaged to someone, but someone else will sleep with them. You’ll build a house, but you won’t get to live in it. You’ll plant a vineyard, but you won’t get to enjoy its fruit. Deuteronomy 28:30 - Modern Text Bible

(The things people work for and hope for will be taken away by others, showing the deep loss and frustration that comes from these curses.)