but yea. Jeannette is in love with him, in the og book (the og book in the comic I mean, not the actual Who Made Me Princess Novel), they married remember? I think the comic tried to hint at her feelings for him but IG it failed to really give readers a good idea of just how much she loved him. He's like her top priority after Claude and Athy.
E not only drew a line because he knew about J's feelings, but he felt suffocated by J. Like in the novel, his whole life was surrounded by her. He was told to protect her, to educate her, to be her playmate, he had no personal space, everything had to be about her. So when Athy appeared, he saw a life where he didn't have J always by his side, instead he could be free and with a person that he chose to be with. That's why he's coldly drawing a line because he's trying to get away from J and all of the things holding him back in life.
Too bad for him, J's super stupid and gets manipulated easily to sheet happens and she end sup getting banished. And E decides to follow J in banishment to take care of her. So he ends up taking care of her for the rest of his life. F for Ezekiel LOL.