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I feel like at the end of Bridgerton season 3, or when Pen and Colin FINALLY marry, we'll see Phillip Crane at the Polin wedding, due to the fact that Colin and Phillip really hit it off and most likely became friends. So most likely at the wedding reception, Phillip will be by himself (as his wife did not wish to come to the wedding or she did) and he catches Eloise's eye, who then starts talking with him as she has been badgered by her mother for 2 years now to find a husband, and this man seems somewhat interesting, as he himself is a wallflower (quite unusual for a man). The two start talking and he informs her that he's from Pen's side of the family (via marriage) but Colin invited him to the wedding. They exchange address and start corresponding.