Kent is a special case – she always kept some distance from Balanchine ‘that way’ and it was not for lack of interest on his part. We do know that Balanchine had a number of affairs apart from the marriages and more well known muses. I'm sure that Balanchine was devoted heart and soul to each lady in turn, but if these had been only 'affairs of the heart' then it wouldn't have been necessary to bring such fierce pressure to bear upon the young Suzanne Farrell.
Well Mr. B was a man after all, but the portraits people have painted of him, from his wives to his "muses" to the corps de ballet girls is remarkably consistent: a reserved, polite, somewhat remote man, not the type to have torrid affairs. Even with Farrell, she kind of hints that despite his ardor something held both of them back, and "even if it had been bliss we would have lost something." I always interpreted it as her incredibly tactful manner of saying that she just didn't feel it for him "that way." Considering how many people have told their "Balanchine story," I think that in that department if there had been more to tell more would have been written.
And at this point I don't think it's lingering reverence for Balanchine that's holding anyone back.