It doesn't matter if they have other people, from all people George loves, Calvert is the close to a soulmate. They need to heal their rift, even with having Cavendish, I don't feel that George will truly be happy. His relationship with Calvert almost reminds me of a movie, I don't remember the name, I think it was called "the Duchess", where the Duke end up living with his wife and mistress in the same home, and they learn to live with each other. I almost imagine Granger having lots built at Cowes for navy friends to live, and say, having Calvert and Gatling live with then when they are not in a ship. They can have other live partners, but George and Francis need each other.