If you dream of having plenty of cash that isn't really yours — borrowed money you're spending as though it were your own — it suggests that while others may admire you from a distance, those who know you well will come to see a colder, more self-interested side of your character.
If you dream of freely spending money you've borrowed, it may be a warning that a deception you've been running will soon come to light. The exposure could cost you a friendship you genuinely value.