"He's kind, and he's supportive, and he's 6 ft. 6 in.!" Oprah once told PEOPLE of her longtime steady, who's been with the Queen of Talk for, yes, 25 years. So what has kept the low-key couple together all these years? "You have to have such a strong personal confidence in order to withstand being with somebody to whom the attention is always directed," the media mogul says of her market consultant/motivational speaker beau. "We have such respect for each other and for each of our paths in the world."