User blog comment:B214/High School DxD BorN Episode 10 Review/@comment-94.64.58.210-20150607185744/@comment-26209278-20150608113049

Remember she is under the effect of a curse. While she does love the real one, the curse was focusing and increasing the feeling of jealousy inside of her, which manifested in that clone, which "only cared" for Rias, bewitching her into falling for the clone; it's a form of Issei she wanted at that point, the version she wants before she accepts the other girls feelings for Issei.