Caroline was more intelligent than her husband, and the British 'Prime Minister' (not an official position back then) Robert Walpole became close to her in an effort to get her to influence George in favour of Walpole. One of the many British Queens to be more 'on the ball' than their husbands.
George had his mistresses to be sure (he was a Hanoverian after all) but he was heartbroken by her death. On her deathbed she advised the King to marry again after her death. George replied, immortally, "No! I shall have mistresses!"