What doesnt polonius want ophelia to talk to hamlet?

Polonius does not want Ophelia to talk to Hamlet because he believes that Hamlet's affections for her are not genuine and may lead to heartbreak. He views Hamlet as a potential threat to Ophelia's reputation and well-being, fearing that the prince's intentions could be insincere or fleeting. Additionally, Polonius wants to maintain control over Ophelia's relationships and protect her from any emotional harm.