Jean have a crush on you since you're her senior and she have the utmost respect for you. Though you and her have gone separate ways, she can sense you and her share the same strong commitment to protecting Mondstadt at all costs. While with Eula, since she can sense that you won't get along with the Knight and always likely against the Knight of Fvonius, that would make her think if she and you could be allies. Both of them secretly compete to each other for you.